feat(postgrest): add stripNulls method for null value stripping

[TheSeydiCharyyev]

Description

Adds a stripNulls() method to the PostgREST query builder, enabling null value stripping from JSON responses via the PostgREST nulls=stripped media type parameter.

Related Issue

Resolves supabase/postgrest-js#460

How it works

• Adds a shouldStripNulls flag to PostgrestBuilder
• The stripNulls() method sets this flag
• In .then(), before fetch, the Accept header is modified:
  • Array responses: application/vnd.pgrst.array+json;nulls=stripped
  • Single object responses: application/vnd.pgrst.object+json;nulls=stripped
  • Other formats (CSV, GeoJSON) are not affected

Usage

const { data } = await supabase.from('users').select().stripNulls()
const { data } = await supabase.from('users').select().eq('id', 1).single().stripNulls()

Requires PostgREST 11.2.0+.

Testing

- 3 new tests added (array, single, csv-compatibility)
- All 303 existing tests pass
- Build passes

Checklist

- Code formatted
- Tests passing
- Builds passing
- Used conventional commits

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commit: 4dc6486

[steve-chavez]

How about failing instead when stripNulls is chained with csv?

[TheSeydiCharyyev]

Good idea, will make it throw an error instead. Pushing a fix soon.

[TheSeydiCharyyev]

Updated — stripNulls() now throws immediately when chained after csv(). Tests pass locally (305/310, 5 unrelated env failures).