RFR: 8344800: Add W3C DTDs and XSDs to the JDK built-in Catalog [v2]

[Joe Wang]

> Add DTDs and XSDs from the W3C specifications to the JDK built-in Catalog.

Joe Wang has updated the pull request incrementally with one additional commit since the last revision:

  list files vertically

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22465/files
  - new: https://git.openjdk.org/jdk/pull/22465/files/203053c5..1ebdff31

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22465&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22465&range=00-01

  Stats: 12 lines in 1 file changed: 7 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/22465.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22465/head:pull/22465

PR: https://git.openjdk.org/jdk/pull/22465