Add Shell test cases with internal-io module

[DamithaSenevirathne]

Purpose

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This PR includes Ballerina shell testcases with internal-io module.

Approach

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Samples

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Remarks

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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

Patch coverage: 100.00% and no project coverage change.

Comparison is base (699b670) 76.99% compared to head (ef8f9de) 76.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #40641    +/-   ##
==========================================
  Coverage     76.99%   76.99%            
- Complexity    54493    54533    +40     
==========================================
  Files          3363     3363            
  Lines        202975   203211   +236     
  Branches      26065    26081    +16     
==========================================
+ Hits         156289   156471   +182     
- Misses        38205    38256    +51     
- Partials       8481     8484     +3     

Impacted Files	Coverage Δ
...rc/main/java/io/ballerina/shell/EvaluatorImpl.java	75.65% <ø> (ø)
...erinalang/util/diagnostic/DiagnosticErrorCode.java	99.83% <ø> (-0.01%)	⬇️
...g/wso2/ballerinalang/compiler/desugar/Desugar.java	90.33% <ø> (+0.01%)	⬆️
.../compiler/semantics/analyzer/QueryTypeChecker.java	93.20% <100.00%> (-0.05%)	⬇️

... and 24 files with indirect coverage changes

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