[Feature Request] Support multi-workflow replayer

[cretz]

Describe the solution you'd like

• Support lazy history fetching
  • Should be able to stream-map on top of lazy list from [Feature Request] Rework search attributes and add list endpoint to client #153
  • Need to make sure workflow ID is included with history
• Change replayer to accept iterable of histories instead of a single one (maybe keep the single shortcut) and use Implement multiple histories support for replaying sdk-core#400 to stream them in

[cretz]

Also, come back to #158 and do #158 (comment)