feat(watch): add optional stdin key to exit watch mode cleanly

[ghiscoding]

Description

a simple "Press x to exit watch mode"

Motivation and Context

add a simple keystroke watch to exit the watch mode cleanly

How Has This Been Tested?

Types of changes

• Chore (change that has absolutely no effect on users)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #472 (61d8bfc) into main (5387b4e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 61d8bfc differs from pull request most recent head 6c23569. Consider uploading reports for the commit 6c23569 to get more accurate results

@@            Coverage Diff             @@
##             main     #472      +/-   ##
==========================================
+ Coverage   97.38%   97.39%   +0.01%     
==========================================
  Files         154      154              
  Lines        4536     4544       +8     
  Branches     1058     1060       +2     
==========================================
+ Hits         4417     4425       +8     
  Misses        119      119              

Impacted Files	Coverage Δ
packages/watch/src/watch-command.ts	98.43% <100.00%> (+0.11%)	⬆️

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