sql: support same as (~=) bounding box operator

[timgraham]

It should adopt PostGIS behavior:
https://postgis.net/docs/ST_Geometry_Same.html

Currently it fails like this:

psycopg2.errors.SyntaxError: at or near "=": syntax error
DETAIL:  source SQL:
SELECT "geoapp_state"."id", "geoapp_state"."name", "geoapp_state"."poly"::bytea FROM "geoapp_state" WHERE "geoapp_state"."poly" ~= ST_GeomFromEWKB('\x0101000020e6100000000000000000f03f000000000000f03f'::bytea)

Jira issue: CRDB-2866

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[github-actions]

We have marked this issue as stale because it has been inactive for
18 months. If this issue is still relevant, removing the stale label
or adding a comment will keep it active. Otherwise, we'll close it in
10 days to keep the issue queue tidy. Thank you for your contribution
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[timgraham]

Still a valid issue.