rat cli check and exclude list

[DaanHoogland]

No description provided.

[Copilot]

Pull Request Overview

This PR adds Apache RAT (Release Audit Tool) license checking functionality to the project. RAT is used to verify that all files contain proper Apache Software Foundation license headers.

• Adds automated RAT license checking via GitHub Actions workflow
• Creates an exclude list for files that don't require license headers
• Adds Apache license headers to existing configuration files

Reviewed Changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/rat.yaml	New GitHub Actions workflow to run Apache RAT license checks
.rat-excludes	New exclude list for files that don't require license headers
Makefile	Added Apache license header
.asf.yaml	Added Apache license header

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[vishesh92]

lgtm