Previously, the `Cache::Store` instrumentation would call
`normalize_key` when adding a key to the log. However, this resulted in
the logged key not always matching the actual key written/read from the
cache:

```irb
irb(main):004> cache.write("foo", "bar", namespace: "baz")
D, [2023-11-10T12:44:59.286362 #169586] DEBUG -- : Cache write: baz:foo ({:compress=>false, :compress_threshold=>1024, :namespace=>"baz"})
=> true
irb(main):005> cache.delete("foo", namespace: "baz")
D, [2023-11-10T12:45:03.071300 #169586] DEBUG -- : Cache delete: foo
=> true
```

In this example, `#write` would correctly log that the key written to
was `baz:foo` because the `namespace` option would be passed to the
`instrument` method. However, other methods like `#delete` would log
that the `foo` key was deleted because the `namespace` option was _not_
passed to `instrument`.

This commit fixes the issue by making the caller responsible for passing
the correct key to `#instrument`. This allows `normalize_key` to be
removed from the log generation which both prevents the key from being
normalized a second time and removes the need to pass the full options
hash into `#instrument`.

Co-authored-by: Jonathan Hefner <jonathan@hefner.pro>