RFR: 8308808: SunMSCAPI public keys returns internal key array [v3]

[Ben Perez]

> Changed `getEncoded` for both EC and RSA to return a copy of the internal key array to avoid mutability issues.

Ben Perez has updated the pull request incrementally with two additional commits since the last revision:

 - Removed unnecessary imports
 - Removed unnecessary module in test. Catch null in getEncoded

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14425/files
  - new: https://git.openjdk.org/jdk/pull/14425/files/04b2a9d1..eb5b5948

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14425&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14425&range=01-02

  Stats: 5 lines in 2 files changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/14425.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14425/head:pull/14425

PR: https://git.openjdk.org/jdk/pull/14425