Update Input model for bulk insert or clarify docstring!

[vincentsarago]

The current input model for the bulk extension is a bit unclear to me. Reading

stac-fastapi/stac_fastapi/extensions/stac_fastapi/extensions/third_party/bulk_transactions.py

Lines 14 to 21 in bd6f661

	class Items(BaseModel):
	"""A list of STAC items."""
	items: Dict[str, Any]
	def __iter__(self):
	"""Return an iterable of STAC items."""
	return iter(self.items)

It seems that we have to provide input in form of

{
    "items": {
        "id1": { item1 },
        "id2": { item2 },
        "id3": { item1 }
    }
}

This is kinda weird, and I was expecting to just be able to profile something closer to [item1, item2, item3] 🤷

If the dict form is going to stay, I think we should at least update the doc string (and remove the word list)

cc @geospatial-jeff

[philvarner]

We could also remove this entirely, and add support (currently missing, and therefore out of compliance with the Transaction Extension) for POST /collection/{cid}/items with an ItemCollection body.

[geospatial-jeff]

We could also remove this entirely, and add support (currently missing, and therefore out of compliance with the Transaction Extension) for POST /collection/{cid}/items with an ItemCollection body.

I think this is a really good idea.

[geospatial-jeff]

Fixed w/ #358 #367