Add support for Ristretto255#646

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joernheissler wants to merge 16 commits intopyca:mainfrom joernheissler:ristretto

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Commits on Dec 27, 2021

Remove references to ed25519_from_uniform from __all__. See pyca#408 and pyca#493 .
Jörn Heissler
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Add bindings to Ristretto finite group arithmetics
Jörn Heissler
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Rebase; remove py2 support; support minimal build
Jörn Heissler
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Remove more py2 code
Jörn Heissler
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Commits on Dec 28, 2021

Add type annotations for sodium_is_zero
Jörn Heissler
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Use "# pragma: no branch" instead of else: block
Jörn Heissler
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Add type annotations for ristretto bindings
Jörn Heissler
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Document that multiplication with zero scalar is not allowed
Jörn Heissler
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Return NotImplemented instead of raising a TypeError
Jörn Heissler
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Rework workaround for minimal build
Jörn Heissler
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Add / operator to scalar
Jörn Heissler
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use f-strings for formatting
Jörn Heissler
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Improve tests
Jörn Heissler
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Add type annotations + inline docs for ristretto and tests
Jörn Heissler
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Add high-level documentation for ristretto
Jörn Heissler
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Bump readthedocs python version to 3.8
Jörn Heissler
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