Compile Java regression test sources (1/n)

[peterschrammel]

in preparation to removing all Java compilation products from the repository so that we can eventually compile and test with different JDK versions. We use Maven to compile all Java test sources up-front, each test directory becomes a module. This is significantly faster than calling javac directly for each test directory (because of javac start-up time).

This PR includes the integration of the compilation process (first commit) and two examples how it is going to be used:

• test with single source file
• test that requires jar

There are several test directories that require different kinds of custom compilation, using Jasmin, ASM, etc, which can be handled by customising the build process in the pom.xml files of each test module.

• Each commit message has a non-empty body, explaining why the change was made.
• [n/a] Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• [n/a] The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• [n/a] Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• [n/a] My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• [n/a] White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.76%. Comparing base (0db546b) to head (9e595aa).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8487   +/-   ##
========================================
  Coverage    78.76%   78.76%           
========================================
  Files         1728     1728           
  Lines       198925   198925           
  Branches     18313    18330   +17     
========================================
  Hits        156686   156686           
  Misses       42239    42239           

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