add std,median result to describe method

[jiangzhx]

Rationale for this change

add std,median result to describe method to keep same with polars.

What changes are included in this PR?

calc std,median result for all columns , only include column datatype is is_numeric

describe	id	bool_col	tinyint_col	smallint_col	int_col	bigint_col	float_col	double_col	date_string_col	string_col	timestamp_col
count	8.0	8	8.0	8.0	8.0	8.0	8.0	8.0	8	8	8
null_count	8.0	8	8.0	8.0	8.0	8.0	8.0	8.0	8	8	8
mean	3.5	null	0.5	0.5	0.5	5.0	0.550000011920929	5.05	null	null	null
std	2.4494897427831783	null	0.5345224838248488	0.5345224838248488	0.5345224838248488	5.3452248382484875	0.5879747449513427	5.398677086630973	null	null	null
min	0.0	null	0.0	0.0	0.0	0.0	0.0	0.0	null	null	2009-01-01T00:00:00
max	7.0	null	1.0	1.0	1.0	10.0	1.100000023841858	10.1	null	null	2009-04-01T00:01:00
median	3.0	null	0.0	0.0	0.0	5.0	0.550000011920929	5.05	null	null	null

Are there any user-facing changes?

returned by describe method adds more information。

[alamb]

Very cool -- thank you @jiangzhx

I also appreciate that you broke this feature up into several small PRs. Very much appreciated 🙏

[alamb]

Related to #4974

[ursabot]

Benchmark runs are scheduled for baseline = a95e0ec and contender = 49473d6. 49473d6 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java