RFR: 8298420: PEM API: Implementation (Preview) [v21]

[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 76 commits:

 - merge in JEP 513
 - Merge branch 'master' into pem
 - comments
 - comments
 - comments
 - comments on the 11th
 - comments on the 11th
 - comments
 - toString update
 - non-sealed
   Better X509 KeyPair parsing
 - ... and 66 more: https://git.openjdk.org/jdk/compare/5e50a584...8bf36d6b

-------------

Changes: https://git.openjdk.org/jdk/pull/17543/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17543&range=20
  Stats: 3617 lines in 40 files changed: 3226 ins; 166 del; 225 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