Create a robust Pipy build of OST

[12rambau]

just a draft to summarize what I want to acomplish here:

• [x] create a minimal setup that can be installed everywhere without issue
• [x] lint the lib (Flake8 Black)
• [x] create hooks to force developers to respect these conventions (most of the problems are solved automatically by these hooks)
• [ ] vendor snap
• [x] debug some tests and manage to run them in a venv
• [ ] manage local tests with tox
• [x] create github actions to run the test on push and PR
• [ ] send a coverage report to codecov (the first one will be bad like real bad)
• [x] build a documentation of the API content using sphinx (I think I'll go with the faro template)
• [ ] trigger a rebuild f the doc on PR
• [x] include the notebooks in the doc

Fix #66 #56 #55 #54

[12rambau]

when you install rasterio There is a specific pre-compiled build of GDAL that comes with the wheel. That is usually working on modern platform

[12rambau]

first draft of the doc: https://opensartoolkit.readthedocs.io/en/build/

[codecov-commenter]

Codecov Report

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