Drop asynchronous property

Update to DunitePy v1.0 which removes the asynchronous property, removes aiohttp and adds websocket-client dependencies
In runtime and tests environments remove:
- async/await keywords
- client.close() which is now handled by DuniterPy after each request
- Clean other stuff
Remove pytest-asyncio and asynctest dev dependencies

Edited Mar 28, 2022 by Moul

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