This PR adds CQL support for geometry literals and spatial predicates.

Geometry Literals

POINT (1 2)
LINESTRING (0 0, 1 1)
POLYGON ((0 0, 0 9, 9 0, 0 0))
POLYGON ((0 0, 0 9, 9 0, 0 0),(1 1, 1 8, 8 1, 1 1))
MULTIPOINT ((0 0), (0 9))
MULTILINESTRING ((0 0, 1 1),(1 1, 2 2))
MULTIPOLYGON (((1 4, 4 1, 1 1, 1 4)), ((1 9, 4 9, 1 6, 1 9)))
GEOMETRYCOLLECTION (POLYGON((1 4, 4 1, 1 1, 1 4)), LINESTRING (3 3, 5 5), POINT (1 5))
ENVELOPE (1, 2, 3, 4)

Spatial Predicates

• INTERSECTS - tests whether two geometries intersect
• DISJOINT - tests whether two geometries have no points in common
• CONTAINS - tests whether a geometry contains another
• WITHIN - tests whether a geometry is within another
• EQUALS - tests whether two geometries are topologically equal
• CROSSES - tests whether the geometries cross
• OVERLAPS - tests whether the geometries overlap
• TOUCHES - tests whether the geometries touch
• DWITHIN - tests whether two geometries are within a given distance

it also adds the filter-crs=SRID query parameter.