Asyncio-rpc

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- Nothing changed yet.

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- Dropped `aioredis` package, use `redis` package instead.

- Github actions for unit-tests & linting.

- Numpy is optional.

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- Add support for RPC client graceful shutdown.

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- Disabled logging errors for missing Asyncio futures
for subscriptions.

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- Bugfix: asyncio future that waits for return RPC message needs
to be created before sending RPC message to RPC server.

- Added debug logging statements.

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- Add numpy int32 and int64 serializer.