add compiler #define TEST_MODE which wraps every otit related code section
things to test for this pr:
open serial terminal
run the program
verify it's printing messages like the screenshot below; note the first 3 msgs from otitsInit() about registering tests, then the continuous msgs from the otits task
changes
main
things to test for this pr:
otitsInit()
about registering tests, then the continuous msgs from the otits task