Improve Error Handling and Readibility for downcasting Float32Array, Float64Array, StringArray

[retikulum]

Which issue does this PR close?

Part of #3152.

Rationale for this change

This is the new PR of improving downcasting to Float32Array, Float64Array, StringArray

What changes are included in this PR?

• as_float64_array, as_float32_array, as_string_array is created in datafusion\common\src\cast.rs
• Refactor parts where following lines are used:

as_any().downcast_ref::<Float32Array>().unwrap()

as_any().downcast_ref::<Float64Array>().unwrap()

as_any().downcast_ref::<StringArray>().unwrap()

as_string_array()

Are there any user-facing changes?

I am not sure about it.

[alamb]

Looks great @retikulum -- thank you very much

[liukun4515]

LGTM

[ursabot]

Benchmark runs are scheduled for baseline = 5de9709 and contender = f4996b9. f4996b9 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