[WIP] feat: Add redis client

[uki00a]

See #2224

TODO

• [ ] Remove third-party dependencies
  • db/redis/experimental/cluster/mod.ts depends on lodash-es and cluster-key-slot
  • benchmark code depends on benny
• [ ] Run tests (db/redis/tests) and benchmarks (db/redis/benchmark) in CI

Things to consider

• deno-redis contains experimental features in the experimental/ directory (How should these be treated in deno_std?)
• How should tests be run in CI? (currently ignored)
  • The test code requires that redis-server and redis-cli be installed locally
• I assume that breaking changes may still happen to some APIs in deno-redis

Note

• deno-redis contains benchmark code in benchmark/ directory
  • It runs the same benchmark cases in both deno-redis and ioredis