* feature: Allow adding arbitrary HTTP handlers to RPC HTTP Server.

* feature: Add sync package to handle streaming db files between nodes.

* tweak: Add DB sync server handler to op-supervisor server.

* feature: Use db sync if it's configured and there's no existing db.

* tweak: Use retry lib, which also adds max retries.

* rename: SyncRPC -> SyncEndpoint.

* tweak: Make the initial chain set part of the Server constructor.

* cleanup: Remove unused functions.

* rename: client -> syncClient to avoid package collision.

* fix: Load DepSet and use for sync server.

* tweak: Use client.BasicHTTPClient for sync client.

* fix: Don't double concat the path.

* tests,fix: Set sync resume to true.

* tweak: Add error context.

* tweak: Make http body close lint-friendly.

* tweak: Change retry policy to backoff from 1s to 30s, up to 10 minutes.

* tests,fix: Use require.ErrorIs to handle wrapped error.