class_docstr: Simple key-value store. Instances of this handler shall store any information required by other handlers.
  Context should store anything relevant to the storage handler, e.g. CompanyID, UserID, parent handler name, among others. 
code: def __init__(self, context: Dict, config=None):
      self.config = (
          config if config else os.getenv("MDB_STORAGE_HANDLER_CONFIG")
      )
      self.serializer = (
          pickle if config.get("serializer", "") == "pickle" else dill
      )
      self.context = self.serializer.dumps(context)
  
imports: import os
  import dill
  import pickle
  from typing import Dict
  from hashlib import md5
  import redis
  import sqlite3
label_desc: Use image node_id 1 to create a new KVStorageHandler object  with example: obj = KVStorageHandler(context, config)