feat: support single line comment in the macro file

[ycexiao]

What problem does this PR address?

Closes #18

Support single line comment like

# This is a comment
<macro-commands>

in the macro file.

What should the reviewer(s) do?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (0a48d18) to head (c9cb44b).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   92.94%   92.94%           
=======================================
  Files           4        4           
  Lines         156      156           
=======================================
  Hits          145      145           
  Misses         11       11           

Files with missing lines	Coverage Δ
tests/helper.py	96.87% <ø> (ø)
tests/test_runmacro.py	100.00% <ø> (ø)

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[ycexiao]

@sbillinge, it's ready for review.