9b262e722d
### What changes were proposed in this pull request?
Implement Series.cov
### Why are the changes needed?
That is supported in pandas. We should support that as well.
### Does this PR introduce _any_ user-facing change?
Yes. Series.cov can be used.
```python
>>> from pyspark.pandas.config import set_option, reset_option
>>> set_option("compute.ops_on_diff_frames", True)
>>> s1 = ps.Series([0.90010907, 0.13484424, 0.62036035])
>>> s2 = ps.Series([0.12528585, 0.26962463, 0.51111198])
>>> s1.cov(s2)
-0.016857626527158744
>>> reset_option("compute.ops_on_diff_frames")
```
### How was this patch tested?
Unit tests
Closes #33752 from dgd-contributor/SPARK-36401_Implement_Series.cov.
Authored-by: dgd-contributor <dgd_contributor@viettel.com.vn>
Signed-off-by: Takuya UESHIN <ueshin@databricks.com>
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