feat: conditionalize generic flattening and type casting for streams v1+

[de-sh]

Fixes #XXXX.

Description

• For streams created after the v1 update, generic flattening will be applied.
• All numbers will be stored as float64.
• All string fields with name "date"/"time" that can be parsed as timestamp will be stored as timestamp.

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This PR has:

• been tested to ensure log ingestion and log query works.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.

[nitisht]

Let's add a comment explaining what is V0 vs V1 (and what is the different)

[coveralls]

Pull Request Test Coverage Report for Build 12579727646

Details

• 287 of 417 (68.82%) changed or added relevant lines in 10 files are covered.
• 8 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.9%) to 12.48%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/handlers/http/ingest.rs	167	168	99.4%
src/storage/mod.rs	0	1	0.0%
src/utils/json/flatten.rs	8	9	88.89%
src/handlers/http/logstream.rs	0	2	0.0%
src/kafka.rs	0	2	0.0%
src/event/format/json.rs	32	35	91.43%
src/utils/json/mod.rs	5	8	62.5%
src/event/format/mod.rs	49	77	63.64%
src/metadata.rs	0	43	0.0%
src/handlers/http/modal/utils/ingest_utils.rs	26	72	36.11%

Files with Coverage Reduction	New Missed Lines	%
src/handlers/http/modal/utils/ingest_utils.rs	1	30.43%
src/event/format/mod.rs	2	73.04%
src/utils/json/flatten.rs	2	85.09%
src/metadata.rs	3	1.39%

Totals
Change from base Build 12559557684:	0.9%
Covered Lines:	2317
Relevant Lines:	18565

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💛 - Coveralls

[nikhilsinhaparseable]

looks good

[nitisht]

Please add detailed comments especially in places we're checking for versions. Also we need comments on what is v0