Support setting 'interval' and 'fastestInterval' for continuous updates

[squashmode]

Thank you for making this plugin available!

It would be nice if, when subscribing to locationUpdates(), if both interval and fastestInverval could be passed in and used, rather than the hard-coded values of 5000 and 2500 ms, respectively. This is for the android implementation, I'm not sure if the same applies to iOS.

This could look just like the displacementFilter parameter that is currently passed into that method.

[lukaspili]

I'm planning to add it, but I'm still thinking on the best way to expose it.
Current API is platform-agnostic, but interval and fastestInverval don't have any equivalent on iOS.
I'm leaning towards exposing an additional parameter androidSpecifics for the other LocationRequest options. Would that work for you?

[squashmode]

Yes, that would definitely work.