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Note that the Streaming AEAD Wrapper is still missing, so this is not yet at
feature parity with the other primitives.

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Added DecryptingStream, which wraps a C++ decrypting stream and is returned by streaming_aead.new_decrypting_stream(...).

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This file object will be returned by streaming_aead.new_encrypting_stream(...).

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Added InputStreamAdapter, which wraps an InputStream and adapts it for use in Python.

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This will be used to test the NewCcEncryptingStream wrapper function.

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In case of a partial write BufferedIOBase doesn't return the length of data written, but gives a BlockingIOError that contains the number of characters written.
See https://docs.python.org/3/library/io.html#io.BufferedIOBase.write

Also, RawIOBase returns None (and not 0) when no data can be written.

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This uses KeyTypeManagers to implement the ECIES Key Managers; making the code slightly simpler.

The main simplification happens when we update the tests in a follow up cl.

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We will migrate the test in an upcoming cl.

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We will migrate the test in an upcoming cl.

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