DecimalBuilder should use FixedSizeBinaryBuilder

[HaoYang670]

Which issue does this PR close?

Closes #2026.

Rationale for this change

What changes are included in this PR?

1. Let the DecimalBuilder use FixedSizeBinaryBuilder
2. Deprecate the method from_fixed_size_list_array

Are there any user-facing changes?

Yes

[codecov-commenter]

Codecov Report

Merging #2092 (d20628a) into master (c585544) will decrease coverage by 0.00%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master    #2092      +/-   ##
==========================================
- Coverage   83.73%   83.73%   -0.01%     
==========================================
  Files         224      225       +1     
  Lines       59391    59362      -29     
==========================================
- Hits        49733    49704      -29     
  Misses       9658     9658              

Impacted Files	Coverage Δ
arrow/src/array/array_decimal.rs	90.59% <ø> (ø)
arrow/src/array/builder/decimal_builder.rs	83.03% <90.90%> (-2.34%)	⬇️
parquet/src/data_type.rs	74.25% <0.00%> (-1.49%)	⬇️
parquet/src/file/statistics.rs	91.49% <0.00%> (-1.07%)	⬇️
parquet/src/column/writer.rs
parquet/src/column/writer/encoder.rs	88.46% <0.00%> (ø)
parquet/src/column/writer/mod.rs	92.53% <0.00%> (ø)
parquet/src/encodings/encoding.rs	93.62% <0.00%> (+0.19%)	⬆️

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[ursabot]

Benchmark runs are scheduled for baseline = 02371d2 and contender = 53e9388. 53e9388 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

[HaoYang670]

Thank you @tustvold !