fix(cql2-text): align spatial grammar with CQL2 spec#156
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Replace non-standard ENVELOPE geometry literal with spec-compliant BBOX(west, south, east, north) using comma-separated signed numbers. Remove non-spec RELATE and BBOX predicate rules from the CQL2 text grammar. The AST nodes (ast.Relate, ast.BBox) are preserved for use by other parsers (FES, ECQL).
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Align the CQL2 Spatial conformance class text grammar with the OGC 21-065r2 spec.
Changes
ENVELOPE(x1 x2 y1 y2)and the mergedbboxrule withbbox_literalusing spec-compliantBBOX(west, south, east, north)comma-separated signed numbersBBOX(prop, x1, y1, x2, y2)predicate syntax is legacy OGC Filter, not CQL2 (AST node preserved for FES/ECQL)Spec reference
OGC 21-065r2 §6.8
BNF:
bboxTaggedText = "BBOX" bboxText