pixel based query rects for raster requests

[jdroenner]

• I added an entry to CHANGELOG.md if knowledge of this change could be valuable to users.

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Here is a brief summary of what I did:

• This PR changes the QueryRectangle struct to combine a temporal and a spatial query.

• All QueryRectangles are now created using a static constructor method.

• VectorQueryRectangle use the same components as before just different composition.

• RasterQueryRectangle now use a GridBounds in Pixels.

• Projection might still have a 1Px offset issue:
  

• TODO: Tests

• TODO: Re-Grid-Operator