Refactor DiscoveryService.php

[caendesilva]

Major changes:

• Renames method formatSlugForModel to pathToIdentifier and improves it
• Adds support for customizing media file extensions with an array
• Adds more test cases

[what-the-diff]

• Added a new method to the DiscoveryService class.
• Updated existing methods in the DiscoveryService class to use this new method instead of duplicating code.
• Refactored some other parts of the file for readability and consistency with PSR-12 standards (e.g., spacing, indentation).

[codecov]

Codecov Report

Merging #654 (45068ce) into master (e1c92cb) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #654   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity      1024      1026    +2     
===========================================
  Files            127       127           
  Lines           2551      2554    +3     
===========================================
+ Hits            2551      2554    +3     

Impacted Files	Coverage Δ
...mework/src/Framework/Services/DiscoveryService.php	100.00% <100.00%> (ø)

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