feat: add `IAMRoleSelector` CRD/feature

[a-hilaly]

Implements https://github.com/aws-controllers-k8s/community/pull/2628 (mostly)

Introduces a new IAMRoleSelector CRD that enables dynamic IAM role assignment based on namespace and resource type selectors. This feature provides an alternative to CARM for role selection and cannot be used simultaneously with CARM (enforced by validation).

Key components:

• New IAMRoleSelector CRD with namespace and resource type selectors
• Selector matching logic with AND between selector types, OR within arrays
• Dynamic informer-based cache for IAMRoleSelector resources
• Integration into the reconciler to override CARM role selection
• Alpha feature gate (IAMRoleSelector) defaulting to disabled

Note: ResourceTypeSelector uses schema.GroupVersionKind in the API, which differs from the separate fields approach in the original types. This may need adjustment based on CRD generation requirements.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[a-hilaly]

/retest

[a-hilaly]

/retest

[a-hilaly]

/retest

[a-hilaly]

/retest

[a-hilaly]

/retest

[michaelhtm]

/lgtm

[ack-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, michaelhtm

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[michaelhtm]

/test sqs-controller-test /test ecr-controller-test

[ack-prow[bot]]

@a-hilaly: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
sagemaker-controller-test	c55d9c0bd66acfe045cd82664b860f47e0be5a2e	link	true	/test sagemaker-controller-test
verify-attribution	87ccfa6f1595ceceed9317d17fff2dfac937cceb	link	false	/test verify-attribution
sqs-controller-test	87ccfa6f1595ceceed9317d17fff2dfac937cceb	link	true	/test sqs-controller-test

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