Implement bir, codegen and runtime changes for spread operator

[lochana-chathura]

Purpose

$subject.

Fixes subtask: Implement bir, codegen and runtime changes of #35178

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

Merging #35696 (3d30e38) into spread-operator (ab9f63b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@                Coverage Diff                 @@
##             spread-operator   #35696   +/-   ##
==================================================
  Coverage              74.28%   74.29%           
- Complexity             46781    46804   +23     
==================================================
  Files                   3145     3145           
  Lines                 181774   181858   +84     
  Branches               23527    23541   +14     
==================================================
+ Hits                  135035   135113   +78     
- Misses                 38917    38923    +6     
  Partials                7822     7822           

Impacted Files	Coverage Δ
...llerinalang/compiler/bir/codegen/JvmConstants.java	100.00% <ø> (ø)
...lerina/runtime/internal/values/ArrayValueImpl.java	86.31% <100.00%> (+0.15%)	⬆️
...runtime/internal/values/ListInitialValueEntry.java	100.00% <100.00%> (ø)
...lerina/runtime/internal/values/TupleValueImpl.java	70.92% <100.00%> (+1.63%)	⬆️
...va/org/wso2/ballerinalang/compiler/bir/BIRGen.java	90.81% <100.00%> (+0.02%)	⬆️
...nalang/compiler/bir/codegen/JvmInstructionGen.java	88.96% <100.00%> (+0.09%)	⬆️
...wso2/ballerinalang/compiler/bir/model/BIRNode.java	86.19% <100.00%> (+0.41%)	⬆️
...erinalang/compiler/bir/model/BIRNonTerminator.java	89.02% <100.00%> (ø)
...erinalang/compiler/bir/optimizer/BIROptimizer.java	95.89% <100.00%> (ø)
...lang/compiler/bir/writer/BIRInstructionWriter.java	94.07% <100.00%> (ø)
... and 12 more

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[lasinicl]

Tested. Changes LGTM.

[KavinduZoysa]

Changes are okay,
Shall we add a few tests which use the spread operator in module-init-var-decl?

[pcnfernando]

LGTM