Add rpcs support

[enomis-dev]

Proposed changes

Linked to #316

• rpcs initialization in constructor (rpcs can be specified in 3 different ways and are stored in a rasterio.rpc.RPC object)
• added property method to access rpcs
• improved save method to save rasters with rpcs
• improved reprojection. Reprojection now supports rpcs and the use of the DEM (passed as kwarg)
• added unit tests for constructor, reprojection

[codecov-commenter]

Codecov Report

Merging #317 (f6cdcbd) into master (69c353a) will increase coverage by 0.02%.
The diff coverage is 92.40%.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
+ Coverage   90.84%   90.86%   +0.02%     
==========================================
  Files          38       38              
  Lines        6070     6130      +60     
==========================================
+ Hits         5514     5570      +56     
- Misses        556      560       +4     

Impacted Files	Coverage Δ
telluric/util/raster_utils.py	91.47% <85.71%> (+0.35%)	⬆️
telluric/georaster.py	93.43% <87.50%> (-0.21%)	⬇️
tests/test_georaster.py	100.00% <100.00%> (ø)

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[arielze]

nice work @SimoneDeGasperis

[drnextgis]

Good job @SimoneDeGasperis!