feature: Add relationship between core entities to make it persistable in database

[shivasurya]

Description:

This PR adds relationship between the entities which should help to store them in relational format. Creating relationship between the entities reduces drastically search space to filter nodes while codeql query is executed. Further more adopting #190 class support further drives to implement class and filters by the end users to reduce the search space.

⚠️ One caveat I'm okay with is that if the end user crafts the query without relationship between entities will obviously trigger cartesian product and waste memory and computing time. We could warn the user by checking the cardinality of the dataset before filtering or generating cartesian product and let the user decide to run the query.

Checklist:

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

[codecov]

Codecov Report

Attention: Patch coverage is 74.31598% with 582 lines in your changes missing coverage. Please review.

Project coverage is 69.28%. Comparing base (2337e5f) to head (7b04260).

Files with missing lines	Patch %	Lines
sourcecode-parser/eval/evaluator.go	34.93%	181 Missing and 22 partials ⚠️
sourcecode-parser/model/reftype.go	64.87%	69 Missing and 3 partials ⚠️
sourcecode-parser/model/member.go	61.17%	65 Missing and 1 partial ⚠️
sourcecode-parser/model/expr.go	78.43%	53 Missing and 5 partials ⚠️
sourcecode-parser/tree/construct.go	79.92%	40 Missing and 12 partials ⚠️
sourcecode-parser/cmd/query.go	0.00%	43 Missing ⚠️
sourcecode-parser/db/db.go	57.14%	24 Missing and 12 partials ⚠️
sourcecode-parser/tree/query.go	69.23%	29 Missing and 7 partials ⚠️
sourcecode-parser/tree/java/parse_method.go	95.09%	6 Missing and 2 partials ⚠️
sourcecode-parser/cmd/ci.go	0.00%	7 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #195      +/-   ##
==========================================
- Coverage   72.42%   69.28%   -3.15%     
==========================================
  Files          16       33      +17     
  Lines        2473     3086     +613     
==========================================
+ Hits         1791     2138     +347     
- Misses        639      872     +233     
- Partials       43       76      +33     

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[Copilot]

Copilot reviewed 59 out of 60 changed files in this pull request and generated no comments.

Files not reviewed (1)

• sourcecode-parser/go.mod: Language not supported

Comments suppressed due to low confidence (3)

sourcecode-parser/cmd/query.go:161

• The refactored header output now uses 'MethodDecl.SourceDeclaration' and 'MethodDecl.ID' instead of the previously used file and line number fields. Please verify that these fields consistently represent the desired information across all entity types.

header := fmt.Sprintf("	File: %s, Line: %s \n", greenCode(entity.MethodDecl.SourceDeclaration), greenCode(entity.MethodDecl.ID))

sourcecode-parser/antlr/listener_impl.go:246

• The logic for building the expression tree in ExitEqualityExpression assumes that exactly three stack elements are available for a binary operation. Please double-check that this condition properly handles all valid cases in the grammar.

if len(l.currentExpression) >= 3 {

sourcecode-parser/antlr/listener_impl.go:370

• When initializing the currentExpression stack for the root WHERE clause in EnterExpression, ensure that this reset does not inadvertently discard any necessary state from nested expressions.

l.currentExpression = make([]*ExpressionNode, 0)