[crate_universe] add an annotation to disable pipelining #1733
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The recent support for pipelined compilation (#1275) is great. There are some situations, however, where we need to disable pipelining for specific crates, e.g. #1584. This PR adds a crate annotation option to disable pipelining for rust_library targets generated by cargo_bazel. The alternatives would be patching the crate with the annotations system or disabling pipelining globally.