[PA] Unit test: Added code for test_if_statement in test_gcc_plugin_c.py

[rsulli55]

This test case was preivously stubbed out and marked skip. This PR only includes one unit test as I wanted to get an OK before proceeding onto more of them. In future PRs I plan to include more than one test (as long they as they fit together logically).

PR includes

• A simple C program with two if statements, its CAST json, and its GrFN json which are stored in tests/data and referenced by test_if_statement
• Code fortest_if_statement unit test; it is similar to other unit tests in test_gcc_plugin_c.py

Here are pdfs of the generated CAST and GrFN:

• if_statement--CAST.pdf
• if_statement--GrFN.pdf

I visually expected them, and they look good, but it might be good for another pair of eyes to look over them.

[codecov[bot]]

Codecov Report

Merging #274 (f3e08a0) into master (e03ceb3) will increase coverage by 0.90%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
+ Coverage   66.29%   67.20%   +0.90%     
==========================================
  Files          94       94              
  Lines       17821    17821              
==========================================
+ Hits        11814    11976     +162     
+ Misses       6007     5845     -162     

Impacted Files	Coverage Δ
automates/model_analysis/graph_manipulation.py	70.75% <0.00%> (+0.55%)	:arrow_up:
...s/CAST2GrFN/visitors/cast_function_call_visitor.py	86.60% <0.00%> (+0.89%)	:arrow_up:
...gram_analysis/CAST2GrFN/model/cast_to_air_model.py	82.48% <0.00%> (+4.80%)	:arrow_up:
...mates/program_analysis/GCC2GrFN/gcc_ast_to_cast.py	63.49% <0.00%> (+7.45%)	:arrow_up:
...analysis/CAST2GrFN/visitors/cast_to_air_visitor.py	62.01% <0.00%> (+19.25%)	:arrow_up:

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