Replace Laminas\Cache requirement with PSR-16 Cache

[Jurj-Bogdan]

Q	A
BC Break	yes
RFC	yes

Description

Replaced laminas/laminas-cache with psr/simple-cache in the Cache SaveHandler as discussed in issue #112.

This is however an initial version, as i have a few questions related to the Cache class, which i'll go over in comments on the specific lines. I'll go ahead and add the relevant documentation as soon as a way forward is set.

[gsteel]

This LTGM @Jurj-Bogdan

Before I approve for merge, the other PRs with Mongo and Laminas DB need merging first, followed by a rebase here.

[Jurj-Bogdan]

Just added a few checks without mocking, although i'm open to suggestions about any additions - also reverted the documentation which I must have deleted by mistake