feature: Support for ReturnStmt statement

[shivasurya]

Description:

This pull request introduces support for parsing and handling return statements within the sourcecode-parser module. The main changes involve adding a new ReturnStmt type, updating the graph construction logic to recognize return statements, and extending the test cases to cover this new functionality.

Parsing and Handling Return Statements:

• Added ReturnStmt to the Node struct in construct.go to support return statements in the graph.
• Implemented parsing logic for return statements in ParseReturnStatement function in parse_statement.go.
• Updated the buildGraphFromAST function to handle return statements by creating ReturnStmt nodes.
• Added GetReturnStmt method in query.go to retrieve return statements from the environment.

Updates to Test Cases:

• Modified the TestBuildGraphFromAST function to include return statements in the expected node types and counts. [1] [2] [3]
• Added test cases for the ReturnStmt type in stmt_test.go to verify the GetPP method with various expressions.

Codebase Enhancements:

• Updated generateProxyEnv in query.go to include ReturnStmt in the proxy environment. [1] [2] [3]
• Defined the ReturnStmt struct and its methods in stmt.go to represent return statements and their properties.

Checklist:

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

[codecov]

Codecov Report

Attention: Patch coverage is 53.65854% with 19 lines in your changes missing coverage. Please review.

Project coverage is 72.61%. Comparing base (db8d91e) to head (836e760).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sourcecode-parser/model/stmt.go	18.18%	9 Missing ⚠️
sourcecode-parser/graph/java/parse_statement.go	0.00%	6 Missing ⚠️
sourcecode-parser/graph/query.go	55.55%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
- Coverage   72.94%   72.61%   -0.33%     
==========================================
  Files          16       16              
  Lines        2358     2399      +41     
==========================================
+ Hits         1720     1742      +22     
- Misses        597      616      +19     
  Partials       41       41              

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