RFR: 8300228: ModuleReader.find on exploded module throws if resource name maps to invalid file path

[Alan Bateman]

The ModuleReader implementation for exploded modules maps resource names to file paths. A small oversight is that it doesn't handle InvalidPathException which is thrown when the resource name maps to something that can't be parsed as a file path. This has a knock on impact to Class/ClassLoader getResourceXXX and other usages of ModuleReader.

The existing ModuleReaderTest is updated to include additional resource names to test. I've also moved `@Test` annotation to the test methods so that it's a bit clearer which are the test methods in this source file.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/12035/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12035&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300228
  Stats: 55 lines in 2 files changed: 29 ins; 12 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/12035.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12035/head:pull/12035

PR: https://git.openjdk.org/jdk/pull/12035