RFR: 8321540: ClassSignature.parseFrom() throws StringIndexOutOfBoundsException for invalid signatures [v2]

[Adam Sotona]

> ClassFile API models and parses signatures, however parsing of the signatures mostly throws IIOBE when it fails.
> This patch improves SignaturesImpl parsing methods implementation and errors handling and adds relevant negative tests.
> The parser is not an ultimate signatures validator yet, however this is a step forward to it.
> 
> Please review.
> 
> Thanks,
> Adam

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  updated copyright year

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17058/files
  - new: https://git.openjdk.org/jdk/pull/17058/files/da060bbb..e856dffe

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17058&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17058&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17058.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17058/head:pull/17058

PR: https://git.openjdk.org/jdk/pull/17058