feature: 🍺 Class with inheritance support

[shivasurya]

Description:

Adding support for class with inheritance. Upon implementation,

class SSRFBase {
  string getName() {
    result = "Generic SSRF Sink"
  }
}

// Derived class
class SSRFSink extends SSRFBase {
  string getClass() {
    result = "Request"
  }
}

predicate isSink(Node obj) {
  obj instanceof SSRFSink
}

// Query to use the predicate
from SSRFSink a
where isSink(a)
select a, a.getClass()

Checklist:

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

[codecov]

Codecov Report

Attention: Patch coverage is 26.66667% with 22 lines in your changes missing coverage. Please review.

Project coverage is 72.42%. Comparing base (239922a) to head (6e8ba1e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sourcecode-parser/graph/query.go	26.66%	19 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
- Coverage   72.95%   72.42%   -0.54%     
==========================================
  Files          16       16              
  Lines        2448     2473      +25     
==========================================
+ Hits         1786     1791       +5     
- Misses        622      639      +17     
- Partials       40       43       +3     

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