RFR: 8366457: Add ResourceArea and Arena allocators for the RBTree [v2]

[Johan Sjölen]

> This PR adds Arena and ResourceArea allocators to the RBTree. The test checks that we can make RBTrees from these allocators and that a basic upsert works.

Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:

  Update copyrights

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29082/files
  - new: https://git.openjdk.org/jdk/pull/29082/files/21a1bfae..90724f84

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29082&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29082&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29082.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29082/head:pull/29082

PR: https://git.openjdk.org/jdk/pull/29082