add options to specify the key type or the key serializer to be used when executing a keyed interactive query

[fhussonnois]

Currently, there is no way to specifiy the type of key used to query a state store. We get the default configured key serializer and fallback to the StringSerializer otherwise.

We should support two additionals query options:

• key_type: The type of the key.
  This option should be optional. The valid values are : [STRING, INT, LONG, UUID]. The value is used to infer the corresponding Serializer.

• key_serializer:The serializer to be used for serializing the given key.
  This option should be optional.

When a state store is queried, only one of these options should be used.