Implement dispatching to custom remote functions

[Bhashinee]

Purpose

This is the implementation of the proposal: ballerina-platform/ballerina-library#3670

Examples

Checklist

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

[codecov]

Codecov Report

Base: 82.71% // Head: 82.65% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (853baa7) compared to base (931316a).
Patch coverage: 78.04% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #900      +/-   ##
============================================
- Coverage     82.71%   82.65%   -0.07%     
- Complexity      538      546       +8     
============================================
  Files            50       50              
  Lines          2974     3009      +35     
  Branches        478      489      +11     
============================================
+ Hits           2460     2487      +27     
- Misses          376      378       +2     
- Partials        138      144       +6     

Impacted Files	Coverage Δ
ballerina/annotation.bal	100.00% <ø> (ø)
...na/stdlib/websocket/WebSocketResourceCallback.java	82.50% <0.00%> (-1.40%)	⬇️
.../stdlib/websocket/WebSocketResourceDispatcher.java	83.68% <84.37%> (-0.07%)	⬇️
...ballerina/stdlib/websocket/WebSocketConstants.java	100.00% <100.00%> (ø)
...tdlib/websocket/server/WebSocketServerService.java	100.00% <100.00%> (ø)
...et/client/listener/WebSocketHandshakeListener.java	92.59% <0.00%> (-3.71%)	⬇️

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