Introduce support for OS command execution

[madhukaw]

Purpose

Fixes ballerina-platform/ballerina-library#2852

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec

[codecov]

Codecov Report

Merging #438 (d1239d3) into master (64ad02b) will increase coverage by 1.58%.
The diff coverage is 86.66%.

@@             Coverage Diff              @@
##             master     #438      +/-   ##
============================================
+ Coverage     82.92%   84.50%   +1.58%     
- Complexity       13       25      +12     
============================================
  Files             9       15       +6     
  Lines            82      142      +60     
  Branches         23       35      +12     
============================================
+ Hits             68      120      +52     
- Misses           13       20       +7     
- Partials          1        2       +1     

Impacted Files	Coverage Δ
...io/ballerina/stdlib/os/nativeimpl/WaitForExit.java	40.00% <40.00%> (ø)
...java/io/ballerina/stdlib/os/nativeimpl/Output.java	78.94% <78.94%> (ø)
...n/java/io/ballerina/stdlib/os/nativeimpl/Exec.java	91.66% <91.66%> (ø)
ballerina/os.bal	100.00% <100.00%> (ø)
ballerina/process.bal	100.00% <100.00%> (ø)
...java/io/ballerina/stdlib/os/nativeimpl/Errors.java	100.00% <100.00%> (ø)
...n/java/io/ballerina/stdlib/os/nativeimpl/Exit.java	100.00% <100.00%> (ø)
...ain/java/io/ballerina/stdlib/os/utils/OSUtils.java	90.00% <100.00%> (-10.00%)	⬇️
...io/ballerina/stdlib/os/nativeimpl/ModuleUtils.java	100.00% <0.00%> (+25.00%)	⬆️

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[daneshk]

LGTM