Cache repeated type calculations

[heshanpadmasiri]

Purpose

Reduce runtime type checker overhead by caching repeated type calculations

Part of #42000

Approach

Describe how you are implementing the solutions along with the design details.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

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

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (0823dc9) 0.00% compared to head (b044eba) 76.70%.
Report is 19 commits behind head on master.

Files	Patch %	Lines
...main/java/io/ballerina/runtime/api/types/Type.java	0.00%	4 Missing ⚠️
.../main/java/org/ballerinalang/docgen/Generator.java	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #42111       +/-   ##
=============================================
+ Coverage      0.00%   76.70%   +76.70%     
- Complexity        0    53055    +53055     
=============================================
  Files             9     2884     +2875     
  Lines            35   199997   +199962     
  Branches          0    26034    +26034     
=============================================
+ Hits              0   153401   +153401     
- Misses           35    38141    +38106     
- Partials          0     8455     +8455     

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[HindujaB]

LGTM with only some minor suggestions

[HindujaB]

LGTM