annotations CLI and file UX rework (#1049)

* rename config param label-file

* annotations rework - CLI params, file naming and backups

* lint

* improve cli option error checks

* enable session cookies

* enable session cookies

* add session id

* name annotations file in multi-dataset and multi-user safe manner

* pass data user hash to front-end

* add annotation collection name support to front-end

* add constant for annotation data collection name

* parameterize annotation collection name; make it sticky in the session

* clarify comments

* hard wire a temporary data collection name for testing

* prettier

* test comment

* package command

* set annotations  filename dialog

* name  and hash are visible

* wire up data collection capture

server/app/app.py

@@ -1,4 +1,5 @@
 import os
+import datetime
 
 from flask import Flask
 from flask_caching import Cache
@@ -21,7 +22,10 @@ class Server:
         self.app.json_encoder = Float32JSONEncoder
         self.cache.init_app(self.app)
         Compress(self.app)
-        CORS(self.app)
+        CORS(self.app, supports_credentials=True)
+
+        # enable session data
+        self.app.permanent_session_lifetime = datetime.timedelta(days=50 * 365)
 
         # Config
         SECRET_KEY = os.environ.get("CXG_SECRET_KEY", default="SparkleAndShine")