[5.9] Add bazel configuration #1488
Merged
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This allows bazel users to depend on these libraries directly through the SwiftSyntax repo instead of everyone having to provide their own duplicate BUILD files. Since swift-syntax is pretty uniform this is setup using a simple bazel macro that uses the conventions of swiftpm to setup each library. This also includes a bazel target for always building a library with optimizations which can be useful if you want the improved performance and aren't trying to debug swift-syntax itself.
(cherry picked from commit 0a73615)