Deprecate ValinorConfigFactory and make cuyz/valinor optional

[acelaya]

Shlink is moving into an env-var-based approach for local configs, so options objects are going to be hydrated differently shlinkio/shlink#2224

That makes the ValinorConfigFactory less useful, so this PR marks it as deprecated and makes the cuyz/valinor dependency optional.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (1de7706) to head (bc8af5e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #40   +/-   ##
=========================================
  Coverage     97.80%   97.80%           
  Complexity       19       19           
=========================================
  Files             5        5           
  Lines            91       91           
=========================================
  Hits             89       89           
  Misses            2        2           

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