[Cache] Allow colon in key key (with redis at least)

I noticed something strange with symfony cache. It forbids to use a colon : in the key name.

But, namespacing keys with redis is (was?) a best practice, and so we lose some power when using redis insight for example.

In insight, I can profile redis, and it shows me what keys I use the most by grouping keys by pattern (a:b:c:*)

As you can see, the "TOP KEY PATTERNS" is poorly detailed.

Redis recommends to namespace key with a colon
Redis insight uses this pattern to analyze keys and group results
Symfony forbit me to use a colon in the but
And moreover, Symfony itself, in the very end does use a colon (between the app prefix seed and my key (f-yOWMrlsA:*on the screenshot)

So to me, we should simply remove this restriction

Note: psr restricts this usage

Key - [...] The following characters are reserved for future extensions and MUST NOT be supported by implementing libraries: {}()/@:

But I don't use PSR, And I personally don't care about this PSR since I'm using Symfony contracts.

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