[PostGIS] #5688: Allow 0-tolerance topology loading

[PostGIS]

#5688: Allow 0-tolerance topology loading
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 Reporter:  strk         |      Owner:  strk
     Type:  enhancement  |     Status:  new
 Priority:  medium       |  Milestone:  PostGIS 3.5.0
Component:  topology     |    Version:  master
 Keywords:               |
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 Currently not available as a value of 0 passed to the topology population
 functions mean "use the precision found in the topology.topology record"
 and a 0 in the topology.topology record means "use a computed precision
 based on input geometry".

 A WIP to add proper 0-tolerance support (to avoid snapping) is here:
 https://git.osgeo.org/gitea/postgis/postgis/pulls/6
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5688>
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