feature: IfStmt, DoStmt, WhileStmt, ForStmt and Generic Statement support

[shivasurya]

Description:

This PR attempts to add IfStmt, ForStmt, WhileStmt, DoWhileStmt entity support with predicate support.

1. GetCondition
2. GetElse
3. GetThen
4. GetAPrimaryQlClass
5. ToString

Example query:

FROM IfStmt AS ifs
WHERE ifs.toString() != "null"
SELECT ifs.getIfStmt().GetCondition(), ifs.getIfStmt().GetThen() 

Checklist:

• Tests passing (gradle testGo)?
• Lint passing (golangci-lint run this requires golangci-lint)?

[codecov]

Codecov Report

Attention: Patch coverage is 80.76923% with 45 lines in your changes missing coverage. Please review.

Project coverage is 73.53%. Comparing base (5094373) to head (470ae1e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sourcecode-parser/model/container.go	46.93%	26 Missing ⚠️
sourcecode-parser/graph/query.go	55.55%	16 Missing ⚠️
sourcecode-parser/graph/construct.go	97.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #173      +/-   ##
==========================================
+ Coverage   72.56%   73.53%   +0.97%     
==========================================
  Files          12       15       +3     
  Lines        1950     2184     +234     
==========================================
+ Hits         1415     1606     +191     
- Misses        496      538      +42     
- Partials       39       40       +1     

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