Add Test mode via terminal

[ClutchplateDude]

A new define (TEST_VERIFY_MODE) can be used to make the mount write menus to the terminal (serial port) and await commands from it (numeric keys).
Basic commands like moving RA/DEC/ALT/AZ, connecting to drivers, listing hardware, etc. are implemented.

[openastrotech-bot]

Looks like your PR has code that needs to be changed in order to meet our coding standards!
Here are your options:

1. Apply the patch that was generated by the job
   1. Click details under the failing clang-format check
   2. Click the Artifacts dropdown in the top right
   3. Download + unzip the clang-format-diff.patch file into the OpenAstroTracker-Firmware repo
   4. Run git apply clang-format-diff.patch to make the changes
   5. Commit and push up the formatted code
2. Run clang-format locally
   1. Run the command bash -c 'shopt -s nullglob globstar;GLOBIGNORE=./src/libs/TimerInterrupt/*; for i in ./{.,src/**,unit_tests,boards/**}/*.{c,cpp,h,hpp}; do clang-format -i $i; done'
   2. Commit and push up the formatted code

[julianneswinoga]

You also need to add in TEST_VERIFY_MODE to matrix_build.py because right now this code isn't being checked by CI. I think you also should change all the checks to #if (vs #ifdef) so that #define TEST_VERIFY_MODE 1 enables it. That'll make it easier to use with matrix_build.py

[julianneswinoga]

Just make sure you squash and merge!