RFR: 8352435: Refactor CDS test library for execution and module packaging [v2]

[Ioi Lam]

> In CDS/AOT testing, we have a lot of code that deal with compiling/packaging modules, as well as running various child processes for the training/assembly/production phases.
> 
> Currently, these operations are done in many low-level steps, so it's difficult to understand and maintain:
> 
> https://github.com/openjdk/jdk/blob/fcc2a24291d499f7149debad1250903ddc369d91/test/hotspot/jtreg/runtime/cds/appcds/jigsaw/modulepath/ExportModule.java
> 
> This PR adds a few new classes to simplify the test cases:
> 
> Example: build two modular JAR files into `modulePath`
> 
> 
> CDSModulePackager modulePackager = new CDSModulePackager(SRC);
> modulePath = modulePackager.getOutputDir().toString();
> 
> modulePackager.createModularJar("com.foos");
> modulePackager.createModularJar("com.needsfoosaddexport",
>                                 "--add-exports",
>                                 "com.foos/com.foos.internal=com.needsfoosaddexport");
> 
> 
> Example: use modules in training/assembly/production phases
> 
> 
> SimpleCDSAppTester.of("moduleNeedsJdkAddExport")
>    .classpath(dummyJar)
>    .modulepath(modulePath)
>    .addVmArgs("--add-modules", "com.needsjdkaddexport",
>               "--add-exports", "java.base/jdk.internal.misc=com.needsjdkaddexport", "-Xlog:cds")
>    .appCommandLine("-m", "com.needsjdkaddexport/com.needsjdkaddexport.Main")
>    .setAssemblyChecker((OutputAnalyzer out) -> {
>            out.shouldContain("Full module graph = enabled");
>         })
>     .setProductionChecker((OutputAnalyzer out) -> {
>             out.shouldContain("use_full_module_graph = true; java.base");
>         })
>     .runStaticWorkflow()
>     .runAOTWorkflow();

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  added comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24122/files
  - new: https://git.openjdk.org/jdk/pull/24122/files/88b4bd58..6a95590b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24122&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24122&range=00-01

  Stats: 6 lines in 1 file changed: 5 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24122.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24122/head:pull/24122

PR: https://git.openjdk.org/jdk/pull/24122