WASM Support: Install burn without installing libsqlite3

[mfranzs]

Describe the bug
Attempting to bundle burn into a WASM rust library results in a compile-time failure because libsqlite3 is included

To Reproduce
Installing burn with this snippet (attempting to disable the sqlite flag) causes the failure.

[dependencies.burn]
version = "0.12.1"
default-features = false
features = ["std", "train", "ndarray"]

[dev-dependencies.burn]
version = "0.12.1"
default-features = false
features = ["std", "train", "ndarray"]

Expected behavior
Disabling the sqlite feature should not attempt to install libsqlite3.

Looking at the dependency tree, this is coming from:
burn-core => burn-dataset => r2d2_sqlite => rusqlite => libsqlite3-sys

Desktop (please complete the following information):

• OS: MacOS
• Browser: N/A - All WASM
• Version: 0.12.1

Additional context
I see an example repo that seems to be avoiding this issue, but I'm not sure how. Thanks in advance!

[AlexErrant]

In the above PR I change burn-train's Cargo.toml default featureset to

default = ["metrics", "tui", "burn-core/default", "burn-core/dataset"]

while simultaneously doing

burn-core = { path = "../burn-core", version = "0.12.0", default-features = false }

This removes the hard burn-dataset dependency from burn-core. Perhaps this is enough to build to wasm.

[antimora]

Train in wasm is not supported. You should build with default features disabled, which would force you the library be no-std compatible.