Provide C++ SDK conda package

[Wumpf]

See conda-forge/rerun-sdk-feedstock#18

Requires

• Provide CMake install target setup #4207

-> This implies that we'll have to have a CMake install option, similar to this port to Bazel https://github.com/kyle-figure/bazel-minimal-rerun/blob/main/third_party/rerun/patches/cmake.patch
Note that we should almost certainly not install libarrow as done in this cmake patch, instead we want to depend on another install of arrow.

The tricky part here is that we have to find the right OS/stdlib/linkage permutations and provide all of them (i.e. pretty much the reason why we so far strongly advocated from-source builds for Rerun C++ SDK)

[Wumpf]

Closing in favor of

• C++ package manager request tracking issue #4579