Add slow query parse logging

[frodsan]

• Adds log_min_duration_parse (ms) config option: when set, emits a WARN log for any query whose parse time meets or exceeds the threshold.
• Adds log_query_sample_length (default: 1000) to cap how many characters of the query are included in the log line, keeping logs readable for long queries.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

❌ Patch coverage is 88.00000% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog/src/frontend/router/parser/cache/ast.rs	25.00%	6 Missing ⚠️

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[levkk]

One small type change and also don't forget to run cargo fmt.

To fix the jsonschema error, run cargo run --bin pgdog-jsonschema and commit the diff (.json change).

[frodsan]

@levkk thanks for the review! I fixed the comments in 4052ea5 and f916d57 😄

should we add a default to log_min_duration_parse to enable this feature by default? 🤔

[levkk]

Amazing, thank you.