parquet: export json api with serde_json feature name

[flisky]

Rationale for this change

I'm trying to read parquet file without arrow dependency, for the sake of smaller binary size. However, parquet::record::Row#to_json_value is gated with cli feature flag, which introduces other unnecessary crates.

What changes are included in this PR?

Replace feature = cli with feature = serde_json.

Are there any user-facing changes?

No. serde_json is already covered by cli.

[alamb]

Thanks @flisky

[tustvold]

Thank you for this, would it be possible to instead introduce a top-level "json" feature, as opposed to piggybacking off the optional crates feature. This will be a better UX for users, and future proof it we ever moved to a different JSON implementation

[codecov-commenter]

Codecov Report

Merging #2209 (aa1fb6d) into master (bc493d9) will decrease coverage by 0.04%.
The diff coverage is 31.11%.

❗ Current head aa1fb6d differs from pull request most recent head f0c0dfe. Consider uploading reports for the commit f0c0dfe to get more accurate results

@@            Coverage Diff             @@
##           master    #2209      +/-   ##
==========================================
- Coverage   82.56%   82.52%   -0.05%     
==========================================
  Files         239      239              
  Lines       62269    62304      +35     
==========================================
+ Hits        51415    51417       +2     
- Misses      10854    10887      +33     

Impacted Files	Coverage Δ
arrow-flight/examples/flight_sql_server.rs	0.00% <0.00%> (ø)
arrow-flight/src/sql/server.rs	0.00% <0.00%> (ø)
parquet/src/record/api.rs	96.82% <ø> (ø)
.../src/array/builder/primitive_dictionary_builder.rs	80.30% <100.00%> (+1.61%)	⬆️
...rquet/src/arrow/record_reader/definition_levels.rs	87.34% <0.00%> (-1.27%)	⬇️
parquet_derive/src/parquet_field.rs	65.75% <0.00%> (-0.23%)	⬇️
parquet/src/encodings/encoding.rs	93.62% <0.00%> (+0.19%)	⬆️

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[ursabot]

Benchmark runs are scheduled for baseline = 3505afa and contender = 588f408. 588f408 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