Automatically assume arrow transparency for components (#2608)

Fixes #2606 
On top of #2603 (requires single-field `Point2D` component)

### What

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/2608) (if
applicable)

- [PR Build Summary](https://build.rerun.io/pr/2608)
- [Docs
preview](https://rerun.io/preview/pr%3Acmc%2Fcomponent_always_arrow_transparent/docs)
- [Examples
preview](https://rerun.io/preview/pr%3Acmc%2Fcomponent_always_arrow_transparent/examples)

---------

Co-authored-by: Antoine Beyeler <antoine@rerun.io>

crates/re_types/definitions/rerun/components/class_id.fbs

@@ -12,7 +12,6 @@ namespace rerun.components;
 ///
 /// \rs Used to look up a `crate::components::ClassDescription` within the `crate::components::AnnotationContext`.
 struct ClassId (
-  "attr.arrow.transparent",
   "attr.python.aliases": "int",
   "attr.python.array_aliases": "int, npt.NDArray[np.uint8], npt.NDArray[np.uint16], npt.NDArray[np.uint32], npt.NDArray[np.uint64]",
   "attr.rerun.legacy_fqname": "rerun.class_id",

crates/re_types/definitions/rerun/components/color.fbs

@@ -15,7 +15,6 @@ namespace rerun.components;
 /// \py All other colors are assumed to be in 0-255 gamma sRGB space.
 /// \py If there is an alpha, we assume it is in linear space, and separate (NOT pre-multiplied).
 struct Color (
-  "attr.arrow.transparent",
   "attr.python.aliases": "int, Sequence[int], npt.NDArray[Union[np.uint8, np.float32, np.float64]]",
   "attr.python.array_aliases": "Sequence[Sequence[int]], npt.NDArray[Union[np.uint8, np.uint32, np.float32, np.float64]]",
   "attr.rerun.legacy_fqname": "rerun.colorrgba",

crates/re_types/definitions/rerun/components/draw_order.fbs

@@ -17,7 +17,6 @@ namespace rerun.components;
 ///
 /// Draw order for entities with the same draw order is generally undefined.
 struct DrawOrder (
-  "attr.arrow.transparent",
   "attr.python.aliases": "float",
   "attr.python.array_aliases": "npt.NDArray[np.float32]",
   "attr.rerun.legacy_fqname": "rerun.draw_order",

crates/re_types/definitions/rerun/components/instance_key.fbs

@@ -11,7 +11,6 @@ namespace rerun.components;
 
 /// A unique numeric identifier for each individual instance within a batch.
 struct InstanceKey (
-  "attr.arrow.transparent",
   "attr.python.aliases": "int",
   "attr.python.array_aliases": "npt.NDArray[np.uint64]",
   "attr.rerun.legacy_fqname": "rerun.instance_key",

crates/re_types/definitions/rerun/components/keypoint_id.fbs

@@ -19,7 +19,6 @@ namespace rerun.components;
 /// \rs
 /// \rs Used to look up an `crate::components::AnnotationInfo` for a Keypoint within the `crate::components::AnnotationContext`.
 struct KeypointId (
-  "attr.arrow.transparent",
   "attr.python.aliases": "float",
   "attr.python.array_aliases": "npt.NDArray[np.uint8], npt.NDArray[np.uint16], npt.NDArray[np.uint32]",
   "attr.rerun.legacy_fqname": "rerun.keypoint_id",

crates/re_types/definitions/rerun/components/label.fbs

@@ -11,7 +11,6 @@ namespace rerun.components;
 
 /// A String label component.
 table Label (
-  "attr.arrow.transparent",
   "attr.python.aliases": "str",
   "attr.python.array_aliases": "Sequence[str]",
   "attr.rerun.legacy_fqname": "rerun.label",

crates/re_types/definitions/rerun/components/point2d.fbs

@@ -12,7 +12,6 @@ namespace rerun.components;
 /// A point in 2D space.
 // TODO(cmc): bring back attr.rust.tuple_struct
 struct Point2D (
-  "attr.arrow.transparent",
   "attr.python.aliases": "npt.NDArray[np.float32], Sequence[float], Tuple[float, float]",
   "attr.python.array_aliases": "npt.NDArray[np.float32], Sequence[float]",
   "attr.rerun.legacy_fqname": "rerun.point2d",

crates/re_types/definitions/rerun/components/radius.fbs

@@ -11,7 +11,6 @@ namespace rerun.components;
 
 /// A Radius component.
 struct Radius (
-  "attr.arrow.transparent",
   "attr.python.aliases": "float",
   "attr.python.array_aliases": "npt.NDArray[np.float32]",
   "attr.rerun.legacy_fqname": "rerun.radius",

crates/re_types/definitions/rerun/testing/components/fuzzy.fbs

@@ -9,15 +9,13 @@ namespace rerun.testing.components;
 // ---
 
 table AffixFuzzer1 (
-  "attr.arrow.transparent",
   "attr.rust.derive": "Debug, Clone, PartialEq",
   order: 100
 ) {
   single_required: rerun.testing.datatypes.AffixFuzzer1 (required);
 }
 
 table AffixFuzzer2 (
-  "attr.arrow.transparent",
   "attr.rust.derive": "Debug, Clone, PartialEq",
   "attr.rust.tuple_struct",
   order: 200
@@ -33,15 +31,13 @@ table AffixFuzzer3 (
 }
 
 table AffixFuzzer4 (
-  "attr.arrow.transparent",
   "attr.rust.derive": "Debug, Clone, PartialEq",
   order: 400
 ) {
   single_optional: rerun.testing.datatypes.AffixFuzzer1;
 }
 
 table AffixFuzzer5 (
-  "attr.arrow.transparent",
   "attr.rust.derive": "Debug, Clone, PartialEq",
   "attr.rust.tuple_struct",
   order: 500

crates/re_types/source_hash.txt

@@ -1,4 +1,4 @@
 # This is a sha256 hash for all direct and indirect dependencies of this crate's build script.
 # It can be safely removed at anytime to force the build script to run again.
 # Check out build.rs to see how it's computed.
-dec6b10b9e90c9c95b3e1436c1b53987573319efd121cc5e715c31466163b0bc
+57a9b0fe0f20a438034beaa8924a121cc02d6f527d155b8675b182ab3a84acb3