[SPARK-46553][PS] FutureWarning for interpolate with object dtype

[itholic]

What changes were proposed in this pull request?

This PR proposes to issue a FutureWarning for (DataFrame|Series).interpolate with object dtype.

Why are the changes needed?

To match the behavior with Pandas. Using object dtype for interpolate is deprecated and will raise exception in the future version, so we should issue the proper warning such as Pandas does.

Does this PR introduce any user-facing change?

Given DataFrame below,

>>> psdf = ps.DataFrame({"A": ['a', 'b', 'c'], "B": [1, 2, 3]})
>>> psdf
   A  B
0  a  1
1  b  2
2  c  3

Before

>>> psdf.interpolate()  # Excluding column with object dtype without any warning unlike pandas
   B
0  1
1  2
2  3

After

>>> psdf.interpolate()  # Issuing a proper warning
FutureWarning: DataFrame.interpolate with object dtype is deprecated and will raise in a future version. Call df.infer_objects(copy=False) before interpolating instead.
  warnings.warn(
   B
0  1
1  2
2  3

How was this patch tested?

No behavior changes, so the existing CI should pass.

Was this patch authored or co-authored using generative AI tooling?

No.

[HyukjinKwon]

Merged to master.