sql: support overlaps bounding box operators (|&>, &<|, &<, &>)

[timgraham]

They should adopt PostGIS behavior:
https://postgis.net/docs/ST_Geometry_Overabove.html
https://postgis.net/docs/ST_Geometry_Overbelow.html
https://postgis.net/docs/ST_Geometry_Overleft.html
https://postgis.net/docs/ST_Geometry_Overright.html

Currently they fail with a syntax error.

Jira issue: CRDB-2864

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[timgraham]

Still a valid issue.