feat: extend engine to support live ConfigMap validation (#10)

[vedant-kawale-27]

### Description

This PR extends the recursive discovery engine to support live ConfigMap validation, mirroring the existing Kubernetes Secret reference validation.

Specifically, it:

1. Adds recursive spec parsing to extract ConfigMap references via valueFrom.configMapKeyRef.name and envFrom[*].configMapRef.name in Pod templates.
2. Integrates namespaced ConfigMap existence and key-presence verification via read_namespaced_config_map.
3. Adds a new Type column to the terminal output table to clearly differentiate between SECRET and CONFIGMAP validation rows.
4. Updates GitHub actions formatters and SARIF rule generators (missing-configmap, missing-configmap-key).
5. Adds unit/integration test coverage and a test manifest for local verification.

Closes #10

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Pull Request Checklist

• I have kept changes focused and limited to the stated issue
• I did not commit secrets or .env values
• All tests pass locally via poetry run pytest
• The change was tested with a real sample manifest
• My commits are signed off using git commit -s
• Any new CLI behavior or output change is documented in this PR

[Copilot]

Pull request overview

This PR extends Kuberef’s recursive reference discovery and live cluster validation to include Kubernetes ConfigMap references (in addition to the existing Secret validation), and updates CLI + CI/SARIF outputs to differentiate resource types.

Changes:

• Added recursive extraction of ConfigMap references from Pod specs (configMapKeyRef and configMapRef patterns).
• Added live ConfigMap existence + key validation via read_namespaced_config_map, and introduced a Type column in the Rich output table.
• Updated GitHub annotations/SARIF generation for new ConfigMap-related rules, and added unit/integration tests plus a local test manifest.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/kuberef/main.py	Adds ConfigMap reference extraction and integrates ConfigMap validation into the audit loop; updates CLI table columns.
src/kuberef/formatters.py	Adds GitHub annotation + SARIF messaging/rules for missing ConfigMaps and missing ConfigMap keys.
tests/test_parser.py	Adds unit test for ConfigMap reference extraction and an integration-style CLI test with mocked K8s API.
test-manifests/configmap-test.yaml	Adds a local manual verification manifest covering pass/warn/fail ConfigMap cases.
mock-k8s/mock_k8s_server.py	Introduces a simple mock Kubernetes API server for local/manual testing of secrets/configmaps.

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[vedant-kawale-27]

hee @hudazaan please merge it
today is the last date to merge pr
if any changes please tell asap