Add redis streaming client

[c-w]

Integration tested via:

docker network create redis-test

docker build --target builder -t agogosml -f agogosml/Dockerfile.agogosml agogosml

docker run -d --name redis --rm --network redis-test -p 6379:6379 redis:5-alpine \
  redis-server --requirepass 123456password

docker run -d --rm --network redis-test -it agogosml \
  python -m agogosml.tools.receiver --receiver redis \
  '{"REDIS_URL":"redis://:123456password@redis:6379", "REDIS_CHANNEL":"mychan"}'

docker run -d --rm --network redis-test -it agogosml \
  python -m agogosml.tools.sender --infile README.rst --sender redis \
  '{"REDIS_URL":"redis://:123456password@redis:6379", "REDIS_CHANNEL":"mychan"}'

docker logs -f <id-of-receiver-container>

All Submissions:

• [x] Have you followed the guidelines in our Contributing document?

• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

• [x] Does your PR follow our Code of Conduct?

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?

• [x] Does each method or function "do one thing well"? Reviewers may recommend methods be split up for maintainability and testability.

• [x] Is this code designed to be testable?

• [x] Is the code documented well?

• [x] Does your submission pass existing tests (or update existing tests with documentation regarding the change)?

• [x] Have you added tests to cover your changes?

• [x] Have you linted your code prior to submission?

• [x] Have you updated the documentation and README?

• [x] Is PII treated correctly? In particular, make sure the code is not logging objects or strings that might contain PII (e.g. request headers).

• [x] Have secrets been stripped before committing?