Sampling off session replays based off device.class for iOS/Android SDKs

[sentryadam0000345]

Problem Statement

Currently this is not supported based off the docs listed here.

Solution Brainstorm

Having something similiar to the transactions sampler that we have here would be ideal:

https://docs.sentry.io/platforms/javascript/configuration/sampling/#setting-a-sampling-function

Product Area

Replays