[Feature Request] Allow the addition of custom Rust annotations to generated function definitions about rust-bindgen HOT 4 OPEN

I did just see this code: https://github.com/rust-lang/rust-bindgen/blob/main/bindgen/codegen/postprocessing/merge_extern_blocks.rs#L6 . Which looks like some merging of extern blocks happen. I am checking the version I have been using and I see I am on 0.63, so some of the local behaviour I assumed might have changed in later versions.

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We have already a wasm_import_module_name option that adds such an attribute where you want, afaict. Extending / generalizing that seems better. Given we merge the blocks I think it'd be simpler if we didn't add extra exclusion logic or what not.

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this could also be seen as a generalization of the custom derive callback. Maybe it would make sense to introduce a callback to annotate any rust items with custom attributes and implement the existing callbacks on top of it instead.

from rust-bindgen.

We have already a wasm_import_module_name option that adds such an attribute where you want, afaict. Extending / generalizing that seems better. Given we merge the blocks I think it'd be simpler if we didn't add extra exclusion logic or what not.

I think younger me implemented the extern blocks merge so it only happens if the extern blocks are identical, we would only need to extend this notion of identical to include attributes as well.

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