Provide mpy cross files

[brainelectronics]

This change adds mpy cross compiled *.mpy files based on MicroPython 1.27.0 to the be_upy_blink directory. These files are listed in package_mpy.json and can be installed via

import mip
mip.install("github:brainelectronics/micropython-package-template/package_mpy.json")

The pre-commit hook mpy-cross is generating the latest *.mpy files of the be_upy_blink directory. If new .mpy files are created or change by this hook, the hook will raise an error.
The pre-commit hook upy-package-mpy is added to verify the package_mpy.json file list is up to date.

This closes #36

[codecov-commenter]

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (01a7f59) to head (c46439f).
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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #37   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           11        11           
  Branches         1         1           
=========================================
  Hits            11        11           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[brainelectronics]

Finally LGTMyself