build(awslint): Cache L1 constructs in the CFN resource linter.

[mikewrighton]

Incremental change to improve the performance of awslint. CfnResourceReflection.findByName() was checking the doc tags of every class in the assembly on each call, taking 170s for aws-cdk-lib. This change caches the tagged classes, eliminating the list traversal and taking findByName down to ~2s for the same package.

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✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a50fce8
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).