Use cprover-api Maven dependency in java-models-library

[peterschrammel]

This clearly separates java-models-library from the API exposed by JBMC.
Depends on diffblue/java-models-library#34.

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

[codecov]

Codecov Report

Merging #5684 (e4cd6ac) into develop (203bb3c) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #5684   +/-   ##
========================================
  Coverage    69.50%   69.50%           
========================================
  Files         1243     1243           
  Lines       100680   100690   +10     
========================================
+ Hits         69981    69989    +8     
- Misses       30699    30701    +2     

Flag	Coverage Δ
cproversmt2	43.15% <ø> (ø)
regression	66.40% <ø> (+<0.01%)	⬆️
unit	32.25% <ø> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
src/solvers/strings/string_builtin_function.h	74.39% <0.00%> (-2.44%)	⬇️
jbmc/src/java_bytecode/java_utils.cpp	92.72% <0.00%> (ø)
...code/java_bytecode_concurrency_instrumentation.cpp	97.20% <0.00%> (+0.21%)	⬆️

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