[PostGIS] #1247: [raster] ST_AsRaster aggregate function

[PostGIS]

#1247: [raster] ST_AsRaster aggregate function
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  Reporter:  robe         |      Owner:  strk
      Type:  enhancement  |     Status:  assigned
  Priority:  medium       |  Milestone:  PostGIS 3.6.0
 Component:  raster       |    Version:  master
Resolution:               |   Keywords:
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Comment (by strk):

 I'll keep PR-232 for `ST_BurnToRaster` (as per FV.19) but for this
 ticket's goal I'll use another PR to wrap `ST_Union` (raster version) so
 the aggregate is faster. This matches the original request by Regina.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/1247#comment:10>
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