Consider adding `Actor.use_state`

[Pijukatel]

Context: apify/apify-docs#2176 (comment)

[B4nan]

IMO nothing to consider here, this is missing, it should be here, let's add it asap so we don't block that docs PR.

[B4nan]

@Mantisus can you look into this please?

[Pijukatel]

It has to take this into account apify/crawlee-python#1669

Given the discussion here apify/crawlee-python#1669 (comment)
the Actor.use_state should access the same state as the first default crawler. So key CRAWLEE_STATE_0 (depends on the implementation there)