Add header name mapping for record fields and add util functions for conversions

[TharmiganK]

Purpose

$Subject

Fixes: ballerina-platform/ballerina-library#7018
Fixes: ballerina-platform/ballerina-library#7019

Examples

Refer to the above attached issue for examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• Checked the impact on OpenAPI generation - Added via this PR

[codecov]

Codecov Report

Attention: Patch coverage is 98.11321% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.32%. Comparing base (b222df2) to head (3b117aa).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
...lerina/stdlib/http/api/nativeimpl/ExternUtils.java	96.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2153      +/-   ##
============================================
- Coverage     80.42%   80.32%   -0.11%     
- Complexity        0      669     +669     
============================================
  Files           366      408      +42     
  Lines         20738    22988    +2250     
  Branches       4841     5271     +430     
============================================
+ Hits          16679    18465    +1786     
- Misses         3123     3385     +262     
- Partials        936     1138     +202     

Flag	Coverage Δ
	80.32% <98.11%> (-0.11%)	⬇️

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[daneshk]

LGTM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud