Add advanced code action and completions

[niveathika]

Purpose

Fixes: ballerina-platform/ballerina-library#7864

Examples

Checklist

• Linked to an issue
• Updated the specification
• Updated the changelog
• Added tests
• Checked native-image compatibility

[codecov]

Codecov Report

Attention: Patch coverage is 72.62570% with 49 lines in your changes missing coverage. Please review.

Project coverage is 55.24%. Comparing base (a2e56a7) to head (0236425).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
ballerina/mssql_listener.bal	0.00%	9 Missing ⚠️
ballerina/oracledb_listener.bal	0.00%	9 Missing ⚠️
ballerina/postgresql_listener.bal	0.00%	9 Missing ⚠️
ballerina/mysql_listener.bal	44.44%	5 Missing ⚠️
.../compiler/codeaction/AbstractChangeReturnType.java	75.00%	2 Missing and 2 partials ⚠️
.../cdc/compiler/codeaction/ChangeToRemoteMethod.java	77.77%	2 Missing and 2 partials ⚠️
...iler/completion/CdcServiceBodyContextProvider.java	86.20%	2 Missing and 2 partials ⚠️
...cdc/compiler/validator/CdcServiceAnalysisTask.java	0.00%	2 Missing and 1 partial ⚠️
...b/cdc/compiler/validator/CdcFunctionValidator.java	97.61%	1 Missing ⚠️
...ib/cdc/compiler/validator/CdcServiceValidator.java	83.33%	0 Missing and 1 partial ⚠️

❌ Your project status has failed because the head coverage (55.24%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #6      +/-   ##
============================================
+ Coverage     51.54%   55.24%   +3.70%     
- Complexity      138      169      +31     
============================================
  Files            26       32       +6     
  Lines           875      972      +97     
  Branches        180      184       +4     
============================================
+ Hits            451      537      +86     
- Misses          389      395       +6     
- Partials         35       40       +5     

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