Expand delta codec

[streamich]

• Whole document as Delta encoding
• Efficient delta-of-delta computation, from blob of delta without booting up the whole Model
• Ability for Patch to encode different SID operations
• Ability to create a Patch and/or Batch from Delta
• Ability for the server to merge document state
  • Create synthetic history ops
• Ability for the server to merge delta exchange
  • Create synthetic history ops