30315 memory leak weak hashmap keys

[benjamin-confino]

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Creates a unique object to serve as keys to annotation scanning caches, created and destroyed by an application metadata listener. This fixes a memory leak.

Fixes #30315

TODO!

[] Rebase on integration and run a build, once we get the POC vote this branch will be quite stale.

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Please code review feature-related files, @OpenLiberty/delivery-approvers

[benjamin-confino]

All looking good, but we need a POC vote before we make the changes to the externals. Converting to a draft for now.