Fix max and min value for decimal precision greater than 38

[viirya]

Which issue does this PR close?

Closes #2246.

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

[viirya]

This is only 38 digits, it should be 39. 😓

[viirya]

ditto.

[codecov-commenter]

Codecov Report

Merging #2245 (d99cec4) into master (d727618) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #2245      +/-   ##
==========================================
- Coverage   82.30%   82.30%   -0.01%     
==========================================
  Files         240      241       +1     
  Lines       62436    62437       +1     
==========================================
  Hits        51391    51391              
- Misses      11045    11046       +1     

Impacted Files	Coverage Δ
arrow/src/array/array_decimal.rs	90.32% <ø> (ø)
arrow/src/array/data.rs	85.03% <ø> (ø)
arrow/src/datatypes/datatype.rs	62.61% <16.66%> (-0.08%)	⬇️
arrow/src/compute/kernels/cast.rs	95.82% <50.00%> (ø)
arrow/src/array/builder/decimal_builder.rs	86.09% <100.00%> (-0.19%)	⬇️
arrow/src/array/mod.rs	100.00% <0.00%> (ø)
integration-testing/src/lib.rs	0.00% <0.00%> (ø)
parquet_derive/src/parquet_field.rs	65.98% <0.00%> (ø)
arrow/src/array/array_fixed_size_binary.rs	90.37% <0.00%> (ø)
parquet/src/arrow/schema.rs	96.93% <0.00%> (+0.17%)	⬆️
... and 2 more

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[ursabot]

Benchmark runs are scheduled for baseline = f41fb1c and contender = 281cd79. 281cd79 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-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-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

[alamb]

(Integration testing for the win!)