Add 'Gravity Falls' faker

[vicky-iv]

Add Gravity Falls Faker Data and Provider.

This PR introduces a new Gravity Falls faker dataset inspired by the Disney animated series Gravity Falls.
It includes characters, creatures, quotes, artifacts, Mabel’s sweaters, and Mystery Shack items for generating themed fake data.

[what-the-diff]

PR Summary

• Added New Data Provider: A new data supplier based on the show "Gravity Falls" has been implemented. This feature will allow the generation of data related to elements of the show.
• Updated Documentation: The main documentation (README.md) and the detailed description of providers (providers.md) have been amended to include the new "Gravity Falls" provider.
• Enhanced Entertainment Providers Class: The main class housing the entertainment data suppliers now includes a specific method to access the "Gravity Falls" provider.
• New Class for Gravity Falls Data: An additional class has been created entirely for "Gravity Falls" data generation, including different categories like characters, locations, creatures, and various other elements from the show.
• Localization File Addition: A file containing necessary localization data from "Gravity Falls" has been included in the system.
• Localization Path Update: The main English language class has been updated to recognize the newly added localization data.
• Modified Metadata: The metadata reflecting the system's reach has been enhanced to encompass the latest addition of the "Gravity Falls" provider and the testing specifications dedicated to it.
• Added New Tests: In order to ensure the proper functioning of the new provider and its associated methods, a new set of tests was introduced.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.24%. Comparing base (3676162) to head (65457da).
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1701      +/-   ##
============================================
- Coverage     92.28%   92.24%   -0.05%     
- Complexity     3423     3431       +8     
============================================
  Files           336      337       +1     
  Lines          6769     6779      +10     
  Branches        670      670              
============================================
+ Hits           6247     6253       +6     
- Misses          354      357       +3     
- Partials        168      169       +1     

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