RFR: 8306055: Add a built-in Catalog to JDK XML module [v2]

[Joe Wang]

On Sun, 19 Nov 2023 23:36:16 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Implement the built-in Catalog.
>
> Joe Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove J2SE directory; add note explaining how DTDs are resolved

Tests: Tier 1-3 and JCK passed.
SPECjvm2008: no regression

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PR Comment: https://git.openjdk.org/jdk/pull/16719#issuecomment-1818021731