Slightly improve the way database queries are represented in logging metadata

[gwynne]

These changes are now available in 1.52.1

While this has no visible impact when using the "default" StreamLogHandler, it becomes quite visible when using smarter log handlers which respect the structural representation afforded by Logger.MetadataValue.

For example, with StreamLogHandler, with or without these changes, a given query might get logged like this:

2025-04-14T06:53:04-0500 debug test : action=update filters=["[\"relation\": \"and\", \"group\": \"[\\\"[\\\\\\\"value\\\\\\\": \\\\\\\"00000000-0000-0000-0000-000000000000\\\\\\\", \\\\\\\"field\\\\\\\": \\\\\\\"composite+planet.system_id\\\\\\\", \\\\\\\"method\\\\\\\": \\\\\\\"=\\\\\\\"]\\\", \\\"[\\\\\\\"field\\\\\\\": \\\\\\\"composite+planet.nrm_ord\\\\\\\", \\\\\\\"method\\\\\\\": \\\\\\\"=\\\\\\\", \\\\\\\"value\\\\\\\": \\\\\\\"1\\\\\\\"]\\\"]\"]"] input=["[\"name\": \"AA\"]"] limits=[] offsets=[] schema=composite+planet sorts=[] [FluentKit] Running query

With a smarter log handler (an only slightly modified version of StreamLogHandler in fact), but without these changes, it looks like this:

2025-04-14T06:58:36-0500 debug test : action="update" filters=[[group: [[field: "composite+planet.system_id", method: "=", value: "00000000-0000-0000-0000-000000000000"], [field: "composite+planet.nrm_ord", method: "=", value: "1"]], relation: "and"]] input=[[name: ""AA""]] limits=[] offsets=[] schema="composite+planet" sorts=[] [FluentKit] Running query

Notice that "1" is in quotes and ""AA"" is double-quoted. But with these changes, and the modified handler, the log now looks like this:

2025-04-14T06:59:29-0500 debug test : action="update" filters=[[group: [[field: "composite+planet.system_id", method: "=", value: "00000000-0000-0000-0000-000000000000"], [field: "composite+planet.nrm_ord", method: "=", value: 1]], relation: "and"]] input=[[name: "AA"]] limits=[] offsets=[] schema="composite+planet" sorts=[] [FluentKit] Running query

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Project coverage is 23.86%. Comparing base (0f1b8bf) to head (e707978).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...FluentKit/Query/Database/DatabaseQuery+Value.swift	0.00%	12 Missing ⚠️
...FluentKit/Query/Database/DatabaseQuery+Range.swift	0.00%	8 Missing ⚠️
...urces/FluentKit/Query/Database/DatabaseQuery.swift	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #635      +/-   ##
==========================================
- Coverage   23.91%   23.86%   -0.06%     
==========================================
  Files         149      149              
  Lines        9327     9347      +20     
==========================================
  Hits         2231     2231              
- Misses       7096     7116      +20     

Files with missing lines	Coverage Δ
...urces/FluentKit/Query/Database/DatabaseQuery.swift	21.42% <0.00%> (ø)
...FluentKit/Query/Database/DatabaseQuery+Range.swift	0.00% <0.00%> (ø)
...FluentKit/Query/Database/DatabaseQuery+Value.swift	30.76% <0.00%> (-13.68%)	⬇️

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