Support Temporal values in escape() #43

Temporal is the modern replacement for Date and is now shipping in runtimes (Node 26, etc.). Passing a Temporal value to escape() today falls through to the generic object handling and produces broken SQL:

escape(Temporal.Instant.from('2012-05-07T11:42:03.002Z'));
// currently => garbage / object expansion, not a valid literal

Date is already special-cased; Temporal deserves the same treatment.

Proposed API

Mirror the existing Date behavior, mapping each Temporal type to its natural MySQL literal:

Detection via Object.prototype.toString (Symbol.toStringTag, i.e. [object Temporal.*]), so the Temporal global is never referenced and runtimes without Temporal are unaffected.

Open questions for maintainers

1. Precision — Instant via epochMilliseconds gives millisecond precision (identical to Date). Should sub-ms (µs/ns) be preserved for DATETIME(6), or is matching Date preferred?
2. SqlValue typing — upgrade to TS 6.0.3 to support the esnext.temporal lib? https://www.typescriptlang.org/docs/handbook/release-notes/typescript-6-0.html#new-types-for-temporal
3. Type coverage — include only the 5 date/time-mapped types in the SqlValue union, or all Temporal types?

Reference

Opened #42 as a concrete starting point (structural-typing variant). Happy to adjust the API based on the discussion here.