Heck lot of improvements

Bunch of new features and typed events. Since, we are using emittery there is a breaking change in the arguments of events data. However, TypeScript will report compile errors for same, so fixing them might take couple of minutes only.

Commits

• test: fix failing tests 35bd96f
• test: fix failing tests 4d1e946
• test: update tests 43fa362
• refactor: use emittery and make events typed 4808770
• feat: add reference to the IORedis Command property 0845d18
• feat: add defineCommand and runCommand methods on redis service c2e5414
• feat: add pub/sub methods to redis_manager a3f6d3f
• refactor: define retry strategy inside config 5649489
• refactor: rename connection in stub 187a6cf
• feat: log connection errors and allow listening for new connections 430160e

Full Changelog: v8.0.0-6...v8.0.0-7