Allow rules to provide their own rust-analyzer providers #2487
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This change cleans up the rust-analyzer aspect to support external rules providing their own crate specs. For now only prost implements behavior for this and the rust-analyzer interface is still private. In the future if this proves to be performant and a consistent interface then there should be no issue making this a public part of the
//rust
package.This change incorporates #1875 (special thanks to @snowp!) and addresses performance issues in the generator tool by allowing users of
bazelisk
to ensure theirtools/bazel
scripts run should one be provided and to disable running validation actions when building crate specs.