Configurable emulator logging output

[rhodgkins]

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When using the functions and database emulator together (with emulator:exec) you can get a lot of noisy logs:

i  functions: Beginning execution of "<function-name>"
i  functions: Finished "<function-name>" in ~1s
i  functions: Beginning execution of "<function-name>"
i  functions: Finished "<function-name>" in ~1s
i  functions: Beginning execution of "<function-name>"
i  functions: Finished "<function-name>" in ~1s

When combined with unit tests, the test result output can sometimes get lost in the midst of all these!

Is there anyway a flag or something (i.e. configurable options for emulators in firebase.json?) could be added to firebase emulator:exec to suppress this output?

I'm currently piping the output into grep to remove the above lines but this also removes the nice colour output of the original firebase command 😔 (and also doesn't properly kill the java emulator processes...)