feat: add new templating functions with integration tests

[42atomys]

Relative Issues: Resolve #105

Describe the pull request
This pull request introduces a new feature: the addition of new templating functions along with their corresponding integration tests. These templating functions aim to provide more flexibility and functionality for users, while the integration tests ensure that these new functions work as intended in different use-case scenarios. By introducing these new features, we aim to expand the capabilities of our application, improving its functionality and reliability, and enhancing the user experience.

Checklist

• I have linked the relative issue to this pull request
• I have made the modifications or added tests related to my PR
• I have added/updated the documentation for my RP
• I put my PR in Ready for Review only when all the checklist is checked

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.21 🎉

Comparison is base (526cdb4) 93.94% compared to head (a3d2fb4) 95.16%.

❗ Current head a3d2fb4 differs from pull request most recent head 2597be3. Consider uploading reports for the commit 2597be3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   93.94%   95.16%   +1.21%     
==========================================
  Files          22       22              
  Lines        1040     1302     +262     
==========================================
+ Hits          977     1239     +262     
  Misses         44       44              
  Partials       19       19              

Impacted Files	Coverage Δ
pkg/storage/redis/redis.go	100.00% <ø> (ø)
internal/valuable/valuable.go	96.00% <100.00%> (+0.10%)	⬆️
pkg/formatting/functions.go	100.00% <100.00%> (ø)

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