feat(lint): add scalafix linter

[rafikk]

Supports Scalafix as a linter for Scala code. Scalafix is a refactoring and linting tool from Scala Center that supports both syntactic and semantic code analysis.

Scalafix produces lint diagnostics and rewrite patches for configured rules.

This aspect supports the built-in syntactic and semantic rules. We can amend it in the future to support custom plugins, but I have not yet had a need for this.

Notes:

• Scalafix only produces output in one mode which consists of a mixture of diagnostic lines and rewrite patches. When a configured Scalafix rule is able to produce rewrites, it prints a patch but does not print a diagnostic line, meaning the SARIF reports that this aspects produce are not as precise as would be ideal. We can only produce a generic "Scalafix rewrite suggested" line for diagnostics with rewrites. I've opened an upstream issue to discuss producing diagnostic-only ouput and hope to find time to work on it: Provide machine-readable output for lint & rewrite rules scalacenter/scalafix#2459
• This PR is based on draft in feat: Add scalafix linter support #711 which stalled. I've used the original PR as a starting point.

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Suggested Release Notes

Scala targets can not be linted using scalafix.

Test plan

• New test cases added

[CLAassistant]

All committers have signed the CLA.

[jbedard]

I don't want to add any new deps here as this now effects the module versions of any rules_lint user such as pulling in rules_java - who cares if the rules_lint user doesn't use it, but a rules_lint user might not want rules_java being bumped due to a linter.

I'm proposing any lint tools that require a bazel_dep (other then maybe skylib or bazel-lib) live in their own MODULE. See the new aspect_rules_lint_rust MODULE for the first example - that one is now published to BCR and everything.

In rules_lint v3 I'm proposing everything move out of this root MODULE, for now I just want to avoid adding new ones.

[rafikk]

Thanks for the review @jbedard.

I've moved the scalafix linter into a new module aspect_rules_lint_scala and updated the example code.

Note that this PR still requires changes to the SARIF processor in rules_lint, so the flow here has to be: publish a new rules_lint release with the changes, bump the minimum rules_lint version for scala, and then publish the new aspect_rules_lint_scala release. Let me know if that sounds right to you.

[rafikk]

The CI failure for CI - Vanilla Bazel / integration-test (examples/scala) (pull_request) looks like an infra / repo setup issue.

[rafikk]

CI is green now. @jbedard, would you mind taking a look?