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GH-34787: [Python] Accept zero_copy_only=False for ChunkedArray.to_numpy (#35582)

### Rationale for this change

Addresses GH-34787.

### What changes are included in this PR?

I think this proposes the minimal viable changes to have the same signature as proposed in GH-34787.

### Are these changes tested?

Yes, for now, a single simple test has been introduced to test the correct behavior of `ChunkedArray.to_numpy` with respect to the addition of `zero_copy_only`.

* Closes: #34787

Lead-authored-by: Julien Jerphanion <git@jjerphan.xyz>
Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>