[PostGIS] #5890: Functions to detect/fix off-grid topology vertices

[PostGIS]

#5890: Functions to detect/fix off-grid topology vertices
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 Reporter:  strk         |      Owner:  strk
     Type:  enhancement  |     Status:  new
 Priority:  medium       |  Milestone:  PostGIS 3.6.0
Component:  topology     |    Version:  master
 Keywords:               |
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 As per https://trac.osgeo.org/postgis/ticket/5862#comment:16 we'd need a
 function that is able to find vertices in topology primitives that do not
 fall on the topology precision grid.

 Presence of such off-grid vertices would make it impossible to use
 "precise" overlay operations.

 The function could go along with a topology.MakePrecise function aiming at
 snapping each vertex to the given precision grid, and checking that the
 result is still valid.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5890>
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