Fixes rust-analyzer include_dirs for crates with generated sources #3840
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When a crate contains generated sources,
include_dirsneeds to include BOTH the root_module directory, and the generated sources directory.When
include_dirsis empty, the inclusion of the root_module directory is done automatically, but when settinginclude_dirs, this needs to be done manually.See:
https://github.com/rust-lang/rust-analyzer/blob/a84d92ff213e30fb00d7b812e07c4f67e99dcd29/crates/project-model/src/project_json.rs#L123-L131