optimize polygon simplification per zoom level

[iferencik]

Feature Description

Currently dynamic vector layers in Geohub prefetch the admin geometries from simplified down tables for specific intervals of zoom level in order to reduce the computation time. However the output geometries appear to have gaps at loww zoom lelvels

This needs to be improbed but without affecting the computation times

Feature Implementation

No response

Feature Alternatives

No response

Feature Impact

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Feature Rationale

No response

Feature Considerations

No response

Feature Requirements

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┆Issue is synchronized with this Wrike task by Unito

[JinIgarashi]

I assume we need to set more precise tolerance value to simplify polygons based on zoom level here

https://github.com/UNDP-Data/pgsql/blob/6bcd18603622d3a00c1e14238e28328b07b6624c/src/geohubsql/sql/plpgsql/utils.sql#L298-L332