add config option for disabling auth emulator warning

[fshareef]

Is your feature request related to a problem? Please describe.

I cannot easily develop and test my application due to the annoying emulator warning at the bottom of the page, which cannot be removed without adding custom css or using a config option.

Describe the solution you'd like

Implement the option to disable auth emulator warning as described in this issue (#2773).

This has already been implemented in firebase, but this module does not support it yet.

Describe alternatives you've considered

Adding custom css selectors to hide the warning, which is not optimal.

Additional context

This is what it looks like when the auth emulator is used:

[lupas]

Thanks for the idea, fixed and released it with v7.2.0.

[bluequantum]

i got a same problem! how i can turn off some of emulator? i need to interact with the real data