v0.8.23

New -no-relative-path: flag to control indexing of generated files

Previously, the SemanticDB compiler plugin errored when indexing auto-generated files outside of the configured -sourceroot directory (which is automatically inferred for Bazel builds). This behavior was undesirable because:

• There's no good workaround for the issue
• The error message was cryptic making it difficult to understand what went wrong

For some cases, we were able to detect this situation for Bazel and ignore the indexed file while printing an informative message, but this behavior was also undesirable because we skipping these files means that we can't render hover messages for symbols in those generated files.

This PR fixes the issue by adding a configurable -no-relative-path: flag with the following valid options:

• index_anyways (default): indexes the file but with no guarantee that it's possible to recover the location of the original generated file. This allows us to display accurate hover tooltips for symbols in these files even if "Go to definition" won't work.
• skip: silently ignored these files.
• warning: ignore these files and print a message explaining it was skipped.
• error: fail the compilation process (old default).

• Add -no-relative-path: flag to control indexing of generated files by @olafurpg in #611

Full Changelog: v0.8.22...v0.8.23