[native] Add reanimated makeMutable function type

Summary:
I need the makeMutable function in later diff but there is no flow type for it. In the original ts types https://github.com/software-mansion/react-native-reanimated/blob/2.17.0/src/reanimated2/core.ts#L264 it's typed and exported.

Depends on: D14098

Test Plan: Flow

Reviewers: ashoat, tomek

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D14099