move goto_check_java.h/.cpp to the Java frontend

[kroening]

This code is specific to the Java frontend, and this commit moves it there.

• 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

Merging #6507 (21a6267) into develop (249bee1) will increase coverage by 0.00%.
The diff coverage is 50.66%.

@@           Coverage Diff            @@
##           develop    #6507   +/-   ##
========================================
  Coverage    76.09%   76.10%           
========================================
  Files         1548     1548           
  Lines       166401   166326   -75     
========================================
- Hits        126619   126576   -43     
+ Misses       39782    39750   -32     

Impacted Files	Coverage Δ
jbmc/src/jdiff/jdiff_parse_options.h	100.00% <ø> (ø)
src/analyses/goto_check.cpp	62.50% <ø> (-4.17%)	⬇️
jbmc/src/java_bytecode/goto_check_java.cpp	31.47% <50.66%> (ø)

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