micro:bit key presses functionality (accessibility)

[vandyliu]

Description:

• Can press 'a' and 'b' to simulate button a and button b being pressed
• Can press 'c' to simulate AB button
• Added aria-label for play/stop button to correctly state what it is depending on state
• Can tab onto a button and press enter to simulate the button being pressed
• Commented out hover changes for pins

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Limitations:

Please describe limitations of this PR

Testing:

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• My code follows the style guidelines of this project
• My code has been formatted with npm run format and passes the checks in npm run check
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[xnkevinnguyen]

Nice one

[andreamah]

Awesome work! c: