Closes locationtech#357
Depends on locationtech#420.

* develop: (79 commits)
  remove unused imports
  Python unit tests check read pipeline stages
  Cruft removal.
  Fix for ML transformer read/write
  Add failing unit tests for issue 425 ML custom transformer loading is broken
  PR feedback.
  Fixed `ReprojectToLayer` to work with `proj_raster`. Closes locationtech#357 Depends on locationtech#420.
  break out commented assert into skipped unit test around masking and deserialization
  register rf_local_extract_bit with SQL functions
  Added the ability to do a raster_join on proj_raster types. Fixes locationtech#419.
  Add landsat masking section to masking docs page
  Add mask bits  python api and unit test
  Extract bits should throw on non-integral cell types
  Fix for both masking by def and value; expand code comments; update tests
  Python regression.
  Masking improvements and unit tests.
  Regression
  Added (disabled) integration test for profiling spatial index effects. Reorganized non-evaluated documentationm files to `docs`.
  Add failing unit test for mask by value on 0
  Updated python tests against spatial index functions.
  ...

* develop: (24 commits)
  remove unused imports
  Python unit tests check read pipeline stages
  Cruft removal.
  Fix for ML transformer read/write
  Add failing unit tests for issue 425 ML custom transformer loading is broken
  PR feedback.
  Fixed `ReprojectToLayer` to work with `proj_raster`. Closes locationtech#357 Depends on locationtech#420.
  break out commented assert into skipped unit test around masking and deserialization
  register rf_local_extract_bit with SQL functions
  Added the ability to do a raster_join on proj_raster types. Fixes locationtech#419.
  Add landsat masking section to masking docs page
  Add mask bits  python api and unit test
  Extract bits should throw on non-integral cell types
  Fix for both masking by def and value; expand code comments; update tests
  Python regression.
  Masking improvements and unit tests.
  Regression
  Added (disabled) integration test for profiling spatial index effects. Reorganized non-evaluated documentationm files to `docs`.
  Add failing unit test for mask by value on 0
  Updated python tests against spatial index functions.
  ...

# Conflicts:
#	core/src/main/scala/org/locationtech/rasterframes/expressions/DynamicExtractors.scala
#	core/src/main/scala/org/locationtech/rasterframes/expressions/transformers/XZ2Indexer.scala
#	core/src/main/scala/org/locationtech/rasterframes/extensions/Implicits.scala
#	core/src/test/scala/examples/CreatingRasterFrames.scala
#	core/src/test/scala/org/locationtech/rasterframes/RasterLayerSpec.scala
#	core/src/test/scala/org/locationtech/rasterframes/expressions/XZ2IndexerSpec.scala
#	datasource/src/main/scala/org/locationtech/rasterframes/datasource/raster/RasterSourceRelation.scala
#	datasource/src/test/scala/org/locationtech/rasterframes/datasource/raster/RasterSourceDataSourceSpec.scala

* develop:
  Fix rf_local_extract_bits argument parsing
  remove unused imports
  Python unit tests check read pipeline stages
  Cruft removal.
  Fix for ML transformer read/write
  Add failing unit tests for issue 425 ML custom transformer loading is broken
  Fixed `ReprojectToLayer` to work with `proj_raster`. Closes locationtech#357 Depends on locationtech#420.