Implement new worker semantics - Part I

[lochana-chathura]

Purpose

• Create channel per each worker message send-receive
• Add support for alternate receive up to desugar

Approach

N/A

Samples

N/A

Remarks

N/A

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: 35 lines in your changes are missing coverage. Please review.

Comparison is base (7fd8965) 0.00% compared to head (b9cf39a) 76.72%.
Report is 55 commits behind head on worker_change.

Files	Patch %	Lines
...2/ballerinalang/compiler/desugar/QueryDesugar.java	0.00%	5 Missing ⚠️
...lang/compiler/semantics/analyzer/CodeAnalyzer.java	76.19%	4 Missing and 1 partial ⚠️
.../compiler/semantics/analyzer/DataflowAnalyzer.java	0.00%	4 Missing ⚠️
...compiler/semantics/analyzer/IsolationAnalyzer.java	0.00%	4 Missing ⚠️
...inalang/compiler/tree/SimpleBLangNodeAnalyzer.java	0.00%	3 Missing ⚠️
...ballerinalang/compiler/desugar/ClosureDesugar.java	0.00%	2 Missing ⚠️
...llerinalang/compiler/desugar/ClosureGenerator.java	0.00%	2 Missing ⚠️
...rinalang/compiler/desugar/ConstantPropagation.java	0.00%	2 Missing ⚠️
...g/wso2/ballerinalang/compiler/desugar/Desugar.java	0.00%	2 Missing ⚠️
...main/java/org/ballerinalang/model/TreeBuilder.java	50.00%	1 Missing ⚠️
... and 5 more

Additional details and impacted files

@@                 Coverage Diff                  @@
##             worker_change   #41754       +/-   ##
====================================================
+ Coverage             0.00%   76.72%   +76.72%     
- Complexity               0    52731    +52731     
====================================================
  Files                    9     2883     +2874     
  Lines                   35   198858   +198823     
  Branches                 0    25817    +25817     
====================================================
+ Hits                     0   152572   +152572     
- Misses                  35    37854    +37819     
- Partials                 0     8432     +8432     

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