RFR: 8280682: Refactor AOT code source validation checks [v6]

[Calvin Cheung]

> This changset refactors CDS class paths and module paths validation code into a new class `AOTCodeSource` and related class `AOTCodeSourceConfig`. Code has been moved from filemap.[c|h]pp, classLoader.[c|h]pp, and classLoaderExt.[c|h]pp to aotCodeSource.[c|h]pp. CDS dependencies have been removed from `classLoader.cpp`. More refactoring could be done, such as removing `classLoaderExt.cpp`, in a future RFE.
> 
> Passed tiers 1 - 5 testing.

Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:

  @dholmes-ora comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23476/files
  - new: https://git.openjdk.org/jdk/pull/23476/files/9e4e33dd..70f3efb2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23476&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23476&range=04-05

  Stats: 7 lines in 4 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/23476.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23476/head:pull/23476

PR: https://git.openjdk.org/jdk/pull/23476