RFR: 1357: Add Oracle copyright header format check to jcheck [v2]

[Zhao Song]

On Mon, 9 Dec 2024 22:51:22 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> This patch introduces a copyright jcheck.
>> For pull requests, the check checks the copyright header in all modified files(if the file name matches the regex in .jcheck/conf)
>
> Zhao Song has updated the pull request incrementally with four additional commits since the last revision:
> 
>  - add copyright header
>  - version 2
>  - update
>  - review comment

It's my PR for testing
https://github.com/openjdk/playground/pull/224
It's the .jcheck/conf for testing
https://github.com/openjdk/playground/blob/testSKARA/.jcheck/conf

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PR Comment: https://git.openjdk.org/skara/pull/1702#issuecomment-2529708864