v7.0.0-beta.3

Features:

• Add migration code (#510)
• Use JS values directly in the KV Store instead of Flatbuffers.

Fixes:

• Add workaround for Safari IDB issue
• Stop deep cloning in ReadTransaction and also using Object.freeze() (#480)

Breaking Changes:

• Remove scanAll. It has been deprecated for a while. #511
• Use ReadonlyJSONValue in read transactions