Feature Request: Generate build/debug targets in `launch.json`

Similar to the existing `build` button above targets, I would like to have something that can generate an entry in `launch.json` with an optional field for a path to a debugger binary that can be used to quickly build and debug Bazel targets.

Start by tracing the existing build button above Bazel targets in the VS Code extension and inspect how it invokes targets. Define how a generated launch.json entry should represent the target and optional debugger binary. Done means a user can generate an entry that quickly builds and debugs a Bazel target.

Written by the indexing model from the issue text.