Implement the getLocation API for structured type symbols

[nipunayf]

Purpose

$title.

Fixes #42725

Approach

Implemented an abstract class named StructuredTypeSymbol that holds the common implementation for such structured type symbols.

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.19%. Comparing base (f10ef24) to head (5eb1822).
Report is 23 commits behind head on master.

❗ Current head 5eb1822 differs from pull request most recent head e3fe019. Consider uploading reports for the commit e3fe019 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #42737   +/-   ##
=========================================
  Coverage     77.19%   77.19%           
- Complexity    51286    51292    +6     
=========================================
  Files          2929     2930    +1     
  Lines        204409   204432   +23     
  Branches      26665    26669    +4     
=========================================
+ Hits         157798   157819   +21     
+ Misses        38052    38051    -1     
- Partials       8559     8562    +3     

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[dulajdilshan]

Some minor level comment