feat(cache): redis cache (#8822)

# Which Problems Are Solved

Add a cache implementation using Redis single mode. This does not add
support for Redis Cluster or sentinel.

# How the Problems Are Solved

Added the `internal/cache/redis` package. All operations occur
atomically, including setting of secondary indexes, using LUA scripts
where needed.

The [`miniredis`](https://github.com/alicebob/miniredis) package is used
to run unit tests.

# Additional Changes

- Move connector code to `internal/cache/connector/...` and remove
duplicate code from `query` and `command` packages.
- Fix a missed invalidation on the restrictions projection

# Additional Context

Closes #8130

internal/cache/connector/redis/_util.lua

@@ -0,0 +1,17 @@
+-- keySetKey returns the redis key of the set containing all keys to the object.
+local function keySetKey (object_id)
+    return object_id .. "-keys"
+end
+
+local function getTime()
+    return tonumber(redis.call('TIME')[1])
+end
+
+-- getCall wrapts redis.call so a nil is returned instead of false.
+local function getCall (...)
+    local result = redis.call(...)
+    if result == false then
+        return nil
+    end
+    return result 
+end