arrow

GH-35413: [Python] Add concrete floating point array types to pyarrow public API (#35414)

### Rationale for this change

These concrete types appear to have been overlooked.

### What changes are included in this PR?

n/a

### Are these changes tested?

n/a

### Are there any user-facing changes?

Yes - I didn't rebuild docs, do I need to do that?
* Closes: #35413

Authored-by: Spencer Nelson <spencer@b612foundation.org>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>