chore(keycodes): add comma to keycodes and update usages

[amcdnl]

This PR adds COMMA to the keycodes and updates all the usages where it was manually defined.

[amcdnl]

Note: It would be cool to change this to a string enum and add the rest of the keycodes.

[jelbourn]

LGTM

Why a string enum? Either way, using an enum would be bad for payload size; as separate constants, unused symbols can be tree-shaken away, but a a single enum cannot be broken up.

[amcdnl]

@jelbourn - Gotcha. Thanks for the feedback.

[tinayuangao]

LGTM

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