RFR: 8317611: Add a tool like jdeprscan to find usage of restricted methods [v8]

[Jorn Vernee]

> This PR adds a new JDK tool, called `jnativescan`, that can be used to find code that accesses native functionality. Currently this includes `native` method declarations, and methods marked with `@Restricted`.
> 
> The tool accepts a list of class path and module path entries through `--class-path` and `--module-path`, and a set of root modules through `--add-modules`, as well as an optional target release with `--release`.
> 
> The default mode is for the tool to report all uses of `@Restricted` methods, and `native` method declaration in a tree-like structure:
> 
> 
> app.jar (ALL-UNNAMED):
>   main.Main:
>     main.Main::main(String[])void references restricted methods:
>       java.lang.foreign.MemorySegment::reinterpret(long)MemorySegment
>     main.Main::m()void is a native method declaration
> 
> 
> The `--print-native-access` option can be used print out all the module names of modules doing native access in a comma separated list. For class path code, this will print out `ALL-UNNAMED`.
> 
> Testing: 
> - `langtools_jnativescan` tests.
> - Running the tool over jextract's libclang bindings, which use the FFM API, and thus has a lot of references to `@Restricted` methods.
> - tier 1-3

Jorn Vernee has updated the pull request incrementally with three additional commits since the last revision:

 - Add support for module directories + class path directories
 - sort output for easier diffs
 - Jan comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19774/files
  - new: https://git.openjdk.org/jdk/pull/19774/files/a4723494..a046f6fe

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19774&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19774&range=06-07

  Stats: 275 lines in 8 files changed: 156 ins; 58 del; 61 mod
  Patch: https://git.openjdk.org/jdk/pull/19774.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19774/head:pull/19774

PR: https://git.openjdk.org/jdk/pull/19774