Feature request: protolint support

[alexolog]

Add support for protolint

[DrBlury]

This is a valid feature request. protolint is actively maintained and provides comprehensive linting.

Implementation options we're considering:

1. Direct integration (run protolint and parse output for diagnostics)
2. Document how to use alongside dedicated protolint tooling
3. Support configurable linting backends

We're tracking this as an enhancement. Community input and contributions are welcome!

What would be most valuable to you - bundled support or documentation for using alongside protolint CLI?