Add DJI OSD Warnings to Betaflight

Add DJI OSD Warnings to Betaflight
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In reference to this PR: https://github.com/betaflight/betaflight/pull/9987
DJI OSD Warning elements could be enabled with a simple stroke of the keyboard. The option to enable this feature would be found in the CLI, which would retain the default user experience and add immense value for DJI FPV pilots.
We're tired of waiting for DJI to care about our hobby.
Power to the users!!!
21 have signed. Let’s get to 25!