feat: Add possibility to configure key prefix (Redis, MemCached)

[AJIOB]

• Add possibility to configure key prefix for Redis & MemCached
• Unify Redis & MemCached expiraction time
• Actualize configuration docs

[codecov-commenter]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (ffe3070) 30.77% compared to head (2131617) 30.70%.

Files	Patch %	Lines
src/config.rs	15.62%	18 Missing and 9 partials ⚠️
src/cache/cache.rs	0.00%	6 Missing ⚠️
src/cache/memcached.rs	0.00%	3 Missing ⚠️
src/cache/redis.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2084      +/-   ##
==========================================
- Coverage   30.77%   30.70%   -0.08%     
==========================================
  Files          52       52              
  Lines       19913    19944      +31     
  Branches     9630     9658      +28     
==========================================
- Hits         6129     6123       -6     
- Misses       7959     7990      +31     
- Partials     5825     5831       +6     

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[sylvestre]

if i understand correctly this PR, it isn't going to change the behavior of existing configurations, right?

[AJIOB]

@sylvestre, yes, you are right.

I am not changed the current configuration API. Just documenting, unifying & extending it.

[AJIOB]

@Xuanwo, hello.

What I need to do for merging this PR?

Do we have some problems with this changes? Or I need to split it to few ones?

[Xuanwo]

Thanks!

[Xuanwo]

Those changes LGTM! cc @sylvestre do you want to take another look?

[sylvestre]

thanks!