Tracking issue for Temporal Instant object

[nekevss]

This issue is a tracking issue for the current state Temporal.Instant implementation in Boa and the current work towards #1804.

Builtin property / method	Boa Impl	temporal_rs Impl	100% Conformance
8.2.1 Temporal.Instant.prototype	✅	N/A	✅
8.2.2 Temporal.Instant.from ( item )	✅	✅	❌
8.2.3 Temporal.Instant.fromEpochMilliseconds ( epochMilliseconds )	✅	✅	✅
8.2.4 Temporal.Instant.fromEpochNanoseconds ( epochNanoseconds )	✅	✅	✅
8.2.5 Temporal.Instant.compare ( one, two )	✅	✅	❌
8.3.1 Temporal.Instant.prototype.constructor	✅	N/A	❌
8.3.2 Temporal.Instant.prototype[ %Symbol.toStringTag% ]	✅	N/A	✅
8.3.3 get Temporal.Instant.prototype.epochMilliseconds	✅	✅	❌
8.3.4 get Temporal.Instant.prototype.epochNanoseconds	✅	✅	✅
8.3.5 Temporal.Instant.prototype.add ( temporalDurationLike )	✅	✅	❌
8.3.6 Temporal.Instant.prototype.subtract ( temporalDurationLike )	✅	✅	❌
8.3.7 Temporal.Instant.prototype.until ( other [ , options ] )	✅	✅	❌
8.3.8 Temporal.Instant.prototype.since ( other [ , options ] )	✅	✅	❌
8.3.9 Temporal.Instant.prototype.round ( roundTo )	✅	✅	❌
8.3.10 Temporal.Instant.prototype.equals ( other )	✅	✅	❌
8.3.11 Temporal.Instant.prototype.toString ( [ options ] )	❌	❌	❌
8.3.12 Temporal.Instant.prototype.toLocaleString ( [ locales [ , options ] ] )	❌	❌	❌
8.3.13 Temporal.Instant.prototype.toJSON ( )	❌	❌	❌
8.3.14 Temporal.Instant.prototype.valueOf ( )	✅	N/A	✅
8.3.15 Temporal.Instant.prototype.toZonedDateTimeISO ( timeZone )	❌	❌	❌

The temporal_rs tracker can be found at boa-dev/temporal#12