fix(sink): json timestamptz should contain UTC suffix Z

[xiangjinwu]

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What's changed and what's your intention?

In #9755

Also fix the type cast of Timestamptz in datum_to_json_object to support downstream jdbc connector. Now it will generate a correct string value according to Debezium's document. This is partially related to #9376.

That PR changed from 1516991409.453000 to 2018-01-26 18:30:09.453000. This format is the only format accept by an insert into mysql/tidb.

However, the actual debezium output is 2018-01-26T18:30:09.453Z, no matter it is from postgresql or mysql.
https:/debezium/debezium/blob/main/debezium-core/src/main/java/io/debezium/time/ZonedTimestamp.java

Furthermore, RisingWave json source accepts 2018-01-26T18:30:09.453Z but rejects 2018-01-26 18:30:09.453000 since 1.2.

To distinguish it from timestamp (without time zone), align with debezium as well as RisingWave's own json source, this PR changes the output format in the following cases:

• New kafka / kinesis / pulsar append-only / upsert sinks created without the mode option (see below).
• Existing and new debezium sinks. This is a breaking change but bug fix.

For compatibility, the old format is still used in the following cases:

• Existing kafka / kinesis / pulsar append-only / upsert sinks.
• Existing and new remote sinks.
• Existing and new nats sinks. This will change and follow kafka / kinesis / pulsar once onboarded to new sink syntax.

It also provides a new option for new kafka / kinesis / pulsar append-only / upsert sinks to explicitly select the old format:

• timestamptz.handling.mode = 'utc_without_suffix'

Just for a comparison of the different formats:

format	T with zone	space without zone	space with zone
example	2006-01-02T15:04:05Z	2006-01-02 15:04:05	2006-01-02 15:04:05+00
ISO 8601	✅	❌	❌
RFC 3339	✅	❌	Z or +00:00 but not +00
pg/rw psql input	✅	✅ (session tz)	rw does not support +00
pg/rw psql output			pg +00 but rw +00:00
mysql/tidb/doris input/output		✅ (session tz)
debezium from pg/mysql	✅
pg to_jsonb	✅
rw source json	✅		Z or +00:00 but not +00
rw sink json (before PR)		✅ (always UTC)
rw sink json (after PR)	✅ (new frontend default)	✅ (compatible)

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

For sinks with timestamptz column using json encoding, the output format changed from 2018-01-26 18:30:09.453000 to 2018-01-26T18:30:09.453000Z.

[codecov]

Codecov Report

Merging #13109 (fd9c604) into main (b7195f8) will decrease coverage by 0.01%.
The diff coverage is 53.98%.

@@            Coverage Diff             @@
##             main   #13109      +/-   ##
==========================================
- Coverage   68.10%   68.10%   -0.01%     
==========================================
  Files        1507     1507              
  Lines      255634   255729      +95     
==========================================
+ Hits       174104   174154      +50     
- Misses      81530    81575      +45     

Flag	Coverage Δ
rust	68.10% <53.98%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/connector/src/sink/encoder/json.rs	87.16% <88.09%> (-0.07%)	⬇️
src/frontend/src/handler/create_sink.rs	65.70% <0.00%> (-0.97%)	⬇️
src/connector/src/sink/kafka.rs	31.26% <0.00%> (-0.37%)	⬇️
src/connector/src/sink/nats.rs	0.00% <0.00%> (ø)
src/connector/src/sink/remote.rs	35.95% <50.00%> (+0.25%)	⬆️
src/connector/src/sink/formatter/debezium_json.rs	53.10% <46.15%> (-0.31%)	⬇️
src/connector/src/sink/formatter/mod.rs	30.13% <53.33%> (+0.72%)	⬆️
src/connector/src/sink/encoder/mod.rs	73.58% <28.57%> (-16.16%)	⬇️

... and 3 files with indirect coverage changes

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[tabVersion]

LGTM. I did not realize the issue before. 😭

[StrikeW]

LGTM