Move google/nearby external submodule and gfps_service component to separate repo

[finger563]

Is your feature request related to a problem?

Right now full / deep clone (recursing through all the submodules) takes a little while because the google/nearby repository is quite large / has a lot of submodules. We're actually not using much of what they've got there, and on top of it many users may not be wanting to use the gfps_service component.

Describe the solution you'd like.

Move gfps_service component to a separate repository and move the google/nearby (which is currently under espp/external/nearby) to be within that component's detail folder instead.

Describe alternatives you've considered.

Continuing to force people to fully download google/nearby just to use this repo?

Additional context.

No response

[finger563]

https://github.com/esp-cpp/espp_gfps_service