[Docs]: Map Improvements

[yaythomas]

Issue

1. Docs mention batching for Map step. However, batching is not yet implemented.
2. Wait for condition: Docs show FixedWait, ExponentialBackoff but they do not exist in SDK.
3. According to docs WaitForConditionConfig has a condition field which is not the case
4. Can a checkpointed step return List[Dict] ? Docs state: “Lists containing only primitives” but seems to work
5. Dictionaries are serialized in the following format. Does user pay for original format or this format which will consume more space? -> User pays for serialized version -> Docs should mention this ?

{
  "t": "l",
  "v": [
    {
      "t": "m",
      "v": {
        "virtid": {
          "t": "s",
          "v": "i-0"
        },
        "domid": {
          "t": "i",
          "v": 111111
        },
        "region": {
          "t": "s",
          "v": "us-east-1"
        },
        "target": {
          "t": "s",
          "v": "1.1.1.1"
        },
        "inBytes": {
          "t": "i",
          "v": 0
        },
        "outBytes": {
          "t": "i",
          "v": 4405997760
        },

Page/Location

...

Suggested Fix

No response

[yaythomas]

#282

@durable_execution
def handler(event: dict, context: DurableContext) -> BatchResult[dict]:
    emails = ["jane_doe@example.com", "john_doe@example.org", "invalid"]
    result = context.map(emails, validate_email)
    return result

BatchResult not json serializable. to_dict, assuming R from BatchItem[R] is serializable is serializable.