RFR: 8298420: PEM API: Implementation (Preview) [v5]

[Anthony Scarpino]

> Hi all,
> 
> I need a code review of the PEM API.  Privacy-Enhanced Mail (PEM) is a format for encoding and decoding cryptographic keys and certificates.  It will be integrated into JDK24 as a Preview Feature.  Preview features does not permanently define the API and it is subject to change in future releases until it is finalized.
> 
> Details about this change can be seen at [PEM API JEP](https://bugs.openjdk.org/browse/JDK-8300911).
> 
> Thanks
> 
> Tony

Anthony Scarpino has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 35 commits:

 - comments updates and getPBEID
 - test fixes
 - Merge branch 'master' into pem
 - fix StringBuffer/Builder
   X509C* changes
 - test merge with futures
   docs cleanup
 - review comments part 2
 - pemrecord whitespace
 - review comments and optimizations
 - bad test check
 - internal PEMRecord optimization
 - ... and 25 more: https://git.openjdk.org/jdk/compare/e3a5e265...804e73d6

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Changes: https://git.openjdk.org/jdk/pull/17543/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17543&range=04
  Stats: 2611 lines in 38 files changed: 2301 ins; 137 del; 173 mod
  Patch: https://git.openjdk.org/jdk/pull/17543.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17543/head:pull/17543

PR: https://git.openjdk.org/jdk/pull/17543