Prefix all LocalStore functions with localStore

[schmidt-sebastian]

This addresses an outstanding cleanup from the firestore-exp work. In the later stages of the development, we decided to use consistent prefixes for all free-standing functions so that they we can continue to use the method names from other platforms. This first PR addresses LocalStore.

A class that already follows this pattern is FirestoreClient.

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Latest commit: 3321ae9

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No changes between base commit (44b5251) and head commit (caed292).

Test Logs

• Base (44b5251d): https://github.com/firebase/firebase-js-sdk/actions/runs/413671075
• Head (caed2921): https://github.com/firebase/firebase-js-sdk/actions/runs/414079597