java.util.Pattern flavor for TRegex

[danieljaburek]

Adding support for Java Regex in TRegex (as part of Bachelor thesis)

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[oubidar-Abderrahim]

Thank you for contributing to GraalVM, we will review your PR shortly

[oubidar-Abderrahim]

@djoooooe could you please assign someone to review this PR? let me know if you need me to mirror it to bitbucket. Thank you

[djoooooe]

@djoooooe could you please assign someone to review this PR? let me know if you need me to mirror it to bitbucket. Thank you

Yes, please mirror this PR to bitbucket