Implement `eth_decrypt` and `eth_getEncryptionPublicKey`. This allows decryption backed by the user's private key. The message decryption uses a confirmation flow similar to the messaging signing flow, where the message to be decrypted is also able to be decrypted inline for the user to read directly before confirming.
Update accounts permission history on accountsChanged
Create PermissionsLogController
Fix permissions activity log pruning
Add selectors, background hooks for better UX
Make selected account the first account returned
Use enums for store keys in log controller
Add last selected address history to PreferencesController
