feat(nodes): add high-level images service

feat(nodes): add ResultsServiceABC & SqliteResultsService

**Doesn't actually work bc of circular imports. Can't even test it.**

- add a base class for ResultsService and SQLite implementation
- use `graph_execution_manager` `on_changed` callback to keep `results` table in sync

fix(nodes): fix results service bugs

chore(ui): regen api

fix(ui): fix type guards

feat(nodes): add `result_type` to results table, fix types

fix(nodes): do not shadow `list` builtin

feat(nodes): add results router

It doesn't work due to circular imports still

fix(nodes): Result class should use outputs classes, not fields

feat(ui): crude results router

fix(ui): send to canvas in currentimagebuttons not working

feat(nodes): add core metadata builder

feat(nodes): add design doc

feat(nodes): wip latents db stuff

feat(nodes): images_db_service and resources router

feat(nodes): wip images db & router

feat(nodes): update image related names

feat(nodes): update urlservice

feat(nodes): add high-level images service

invokeai/app/util/misc.py

@@ -6,6 +6,14 @@ def get_timestamp():
     return int(datetime.datetime.now(datetime.timezone.utc).timestamp())
 
 
+def get_iso_timestamp() -> str:
+    return datetime.datetime.utcnow().isoformat()
+
+
+def get_datetime_from_iso_timestamp(iso_timestamp: str) -> datetime.datetime:
+    return datetime.datetime.fromisoformat(iso_timestamp)
+
+
 SEED_MAX = np.iinfo(np.int32).max