Add CI check for ASFv2 license header in the files

[martin-g]

#377 made me realise that we do not have a CI check for ASFv2 license header and many files miss it.

A possible solution is https://github.com/korandoru/hawkeye
Apache DataFusion uses it with this config file: https://github.com/apache/datafusion/blob/main/licenserc.toml

[Kriskras99]

Seems like a good idea. Github CI:

jobs:
  license-header-check:
    runs-on: ubuntu-latest
    name: Check License Header
    steps:
      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
      - name: Install HawkEye
      # This CI job is bound by installation time, use `--profile dev` to speed it up
        run: cargo install hawkeye --version 6.2.0 --locked --profile dev
      - name: Run license header check
        run: ci/scripts/license_header.sh

Might be useful to use something like cargo binstall to not have to compile it

[martin-g]

They provide a Github Action too:

- name: Check License Header
  uses: korandoru/hawkeye@v6

[Kriskras99]

That's even easier! Let's do that

[martin-g]

The tricky part with third-party Github actions is that they need to be allowed for https://github.com/apache/ projects.
I have memories that the Infra team added a selfserve tool but I don't see it at https://selfserve.apache.org/
If the CI check fails that the action is not allowed then either ask Infra team how to enable it or use bininstall.