Fix missing SRID on EPSG:4326

[jesspav]

EPSG:4326 has a unique CRS implementation that accepts an EPSG and OGC code. This was not working with the auth code's srid() function.

Current:

> SELECT ST_SRID(ST_SetSrid(ST_GeomFromText('POINT (100 100)'), 4326));
Execution error: CRS has no SRID

After fix:

> SELECT ST_SRID(ST_SetSrid(ST_GeomFromText('POINT (100 100)'), 4326));
┌──────────────────────────────────────────────────────────────────────────┐
│ st_srid(st_setsrid(st_geomfromwkt(Utf8("POINT (100 100)")),Int64(4326))) │
│                                  uint32                                  │
╞══════════════════════════════════════════════════════════════════════════╡
│                                                                     4326 │
└──────────────────────────────────────────────────────────────────────────┘

Testing

unit test + query validation

[Copilot]

Pull Request Overview

This PR fixes a bug where EPSG:4326 coordinate reference systems were not returning a proper SRID value. The fix adds special handling for longitude/latitude coordinate systems to return SRID 4326 when the srid() function is called.

• Modified the AuthorityCode::srid() implementation to handle lng/lat coordinate systems
• Added test case to verify EPSG:4326 returns the correct SRID value

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[paleolimbot]

Thank you!