Add violation level

[fabiodomingues]

This pull request introduces a new severity level configuration (:level) for violations, updates the analyzer logic to include this level in violation results, and adjusts tests to account for the new functionality. Additionally, it removes unused code and simplifies namespace dependencies logic.

Features and Configuration Updates:

• docs/config.md: Added documentation for the new :level configuration, which defines the severity of violations (:error by default).
• src/clj_depend/config.clj: Updated the default configuration to include the :level key with a default value of :error.

Analyzer Logic Enhancements:

• src/clj_depend/internal_api.clj: Modified the violation analysis logic to associate each violation with its severity level (:level) and updated the result code logic to depend on the presence of :error level violations.

Codebase Simplification:

• src/clj_depend/analyzers/layer.clj: Removed the unused namespace-dependencies function and simplified the namespace dependencies logic.
• src/clj_depend/analyzers/layer.clj: Removed the clojure.set dependency from the namespace declaration as it is no longer needed.

Test Updates:

• test/clj_depend/api_integration_test.clj: Updated tests to include the :level key in violation results and added new tests to validate behavior for different severity levels (:error, :warning, :info). [1] [2] [3] [4] [5]

Checklist

• I created an issue to discuss the problem I am trying to solve or an open issue already exists.
• I added a new entry to CHANGELOG.md
• I updated documentation if applicable (docs folder)

[Copilot]

Pull Request Overview

This PR adds a violation level mechanism to the dependency analyzer along with corresponding tests and documentation updates. Key changes include:

• Updating tests (in api_integration_test.clj) to expect a new violation level field.
• Modifying the internal API to attach the violation level from the configuration.
• Documenting the new :level configuration option.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/clj_depend/api_integration_test.clj	Updated tests to include the new :level field in violations.
src/clj_depend/internal_api.clj	Modified violation processing to associate a level from config.
src/clj_depend/config.clj	Added default :level configuration.
src/clj_depend/analyzers/layer.clj	Removed unused helper function.
docs/config.md	Documented the :level configuration option.

Comments suppressed due to low confidence (1)

src/clj_depend/internal_api.clj:94

• The violation maps' :level field is unconditionally overridden with the config value. Verify that this behavior is intentional, particularly if individual violations might already specify a level.

          violations (->> (snapshot/without-violations-present-in-snapshot-file! violations options)

[Copilot]

[nitpick] Duplicate violation message strings appear across tests; consider extracting them into a shared constant to ease maintenance in case the message needs updating.

Suggested change

	:message "Circular dependency between \"sample.controller.foo\" and \"sample.logic.foo\""
	:message circular-dependency-message