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refactor(backend): run query endpoints end to end on the processing r… (#1387)

* refactor(backend): run query endpoints end to end on the processing runtime

Add services::queries: resolve the source, initialize, plan, query and encode
run as one task on the processing runtime (run_query). Handlers only parse,
validate, watch the connection and build responses.

- WMS GetMap and WCS GetCoverage (queries::raster_grid), OGC API tiles
  (queries::ogc_tile), WFS GetFeature (queries::vector), plots
  (queries::plot) and the raster/vector websocket streams (queries::stream)
- planning is moved as-is, not unified
- connection_closed returns a 'static future; a closed connection aborts
  the whole task, including initialization
- SessionContext::processing_runtime
- one default_time_from_config::<S>() via the DefaultTime trait instead of
  three copies in wms/wcs/wfs
- remove the unused WebsocketStreamTask::new_raster

* refactor(backend): protocol-neutral query types, address review

- WMS and WCS share one RasterGridQuery (crs, bounds, resolution, origin,
  time, bands) plus a RasterEncoding (Png or GeoTiff); the handlers do the
  protocol transformation (axis order, size -> resolution, colorizer -> bands)
- WMS GetMap requires CRS (mandatory in WMS 1.3.0), as the handler now
  needs it before the workflow is initialized
- WFS uses a neutral VectorQuery
- TileQuery lives in queries::ogc_tile, so the tiles handler module stays
  private
- plots fall back to the data's crs when none is requested
- rename optimize_for_request_resolution to rewrite_for_request_resolution

* test(backend): cover missing WMS crs, plot crs fallback and processing runtime; stop connection monitors with their request

* refactor(backend): adapt query service to processing graph naming and typed operators

* refactor(backend): split raster_grid by step, address review

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