Self-hosted server sync

[tmpfs]

• Mutex in user storage, prevent writes whilst sync in progress
• Support multiple remotes (self-hosted / platform backend)
• Remove StorageProvider trait
• Remove PatchFile type, just use in-memory patches
• Make calls to sync_before_apply_change infallible (otherwise it would prevent local writes)
• Return error of sync_send_events along with value so callers can see if their local changes were applied to a remote, this can be an additional Option<Error> return value
• Sync across multiple remotes should return a list of errors and continue processing other remotes if an earlier one fails
• Improve sos check log verbose output as a debugging aid
• Merge AppPaths into UserPaths
• Move storage modules into account
• Use Arc for UserPaths after initialization (then we don't need to keep await in UserStorage - remove paths() and just clone the Arc)
• Ensure running tests do not pollute the application debug path (some tests are still writing to it!)
• Add sos check events for a verbose listing of all the events in a folder
• Move rpc module from sos-sdk to sos-net
• Handle sync of delegated passphrases as folders are created and removed
• Exponential backoff for websocket re-connection
• Shutdown channel in WebSocketHandle to close the connection
• Identity Gatekeeper should be behind Arc+RwLock
• Server locks should lock each account and not the entire server state
• Move LocalProvider to sos_sdk
• Make EventLogFile generic over the type of event
• Support AccountEvent and AccountEventLog for account level events (eg: create/delete folders)
• Remove lifetime from WriteEvent - we have to convert to owned anyhow, just clone it when needed
• Remove libp2p and peer module
• Create events subcommand (move from check events) and add support for account and file event logs
• Initialize account and file logs from state on disc
• Refactor AccountsList into Account
• Support FileEvent and FileEventLog to track changes to external files
• Save and load server definitions to disc
• Assert on file event log
• Put account/search behind a feature flag
• Assert on account event log
• Fold sos-migrate into sos-sdk behind the migrate feature flag
• Add export_unsafe_archive and import_file to LocalAccount
• Update audit trail test to use LocalAccount
• Remove UpdateVault variant from WriteEvent
• Log file events when deleting a folder!
• Assert on file event log
  • Delete folder files
• Assert on folder event log
  • Set vault meta
• Move file management to folder storage so we can use FolderStorage on the server-side as well
• Server manages account/file event logs
• Move audit logs inside FolderStorage
• Remove audit logs from server (now handled inside the FolderStorage)
• Write device vault to different location as standard folders (vaults) (it doesn't have an event log so appears a bit weird when looking in the folders - write to device directory instead?)
• Use remote instead of local for server-side directories?
• Store trusted devices in the account devices vault
• Use trusted device public keys to encrypt folder passwords for syncing #242
• Remove SecureAccessKey and listen bridge channels
• Use Folder type in IdentityVault so we track changes
• Refactor to store identity vault server-side
• Include commit proof for identity vault in account status
• Support allow/deny config
• Move audit trail behind a feature flag
• Include and verify device signature for restricted service endpoints
• Send device event log to server so trusted devices can be synced
• Include device event log in diff/merge logic
• Test spec for enrolling a device
• Test spec for revoking a device
• Remove noise protocol support
• The Origin type can be a struct not an enum now (as the API will be the same for self-hosted and cloud)
• Include external files in sync
• Refactor to REST API
• Add init command to server - write out config file
• Add OpenAPI definitions
• Remove RPC implementation, encoding (once REST API is ready)
• Explicitly close listeners in listen test specs (either sign out or delete account)

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Tests

• Create secret
• Update secret
• Delete secret
• Change folder name
• Create folder
• Delete folder
• Import folder
• Server offline
• Changes listener
• Write secrets after syncing folder via create/import folder events
• Multiple listeners
• Multiple remotes
• Multiple remotes with failure beforehand
• Shutdown all websocket listeners on sign out
• Assert on number of server websocket connections (requires endpoint)
• External files
• Update file

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• Full sync handles new folders
• Full sync handles deleted folders
• Full sync handles file diffs

Closes #191 and closes #222 and closes #224 and closes #228.