Update version to 19.0.0 and add CHANGELOG

[alamb]

Which issue does this PR close?

Re #2051

Rationale for this change

Keep the release train rolling! 🚋

What changes are included in this PR?

1. Update versions to 19.0.0
2. Update changelog -- rendered version https://github.com/alamb/arrow-rs/blob/alamb/prepare_for_19.0.0/CHANGELOG.md

Are there any user-facing changes?

See above

[codecov-commenter]

Codecov Report

Merging #2120 (d51d298) into master (576069a) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head d51d298 differs from pull request most recent head b970c74. Consider uploading reports for the commit b970c74 to get more accurate results

@@            Coverage Diff             @@
##           master    #2120      +/-   ##
==========================================
- Coverage   83.75%   83.74%   -0.01%     
==========================================
  Files         225      225              
  Lines       59486    59486              
==========================================
- Hits        49821    49817       -4     
- Misses       9665     9669       +4     

Impacted Files	Coverage Δ
...row/src/array/builder/string_dictionary_builder.rs	90.64% <0.00%> (-0.72%)	⬇️
parquet_derive/src/parquet_field.rs	65.75% <0.00%> (-0.46%)	⬇️
arrow/src/datatypes/datatype.rs	64.05% <0.00%> (-0.36%)	⬇️

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[ursabot]

Benchmark runs are scheduled for baseline = 567c457 and contender = c3e019f. c3e019f 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