Add greek translations for Ancient provider

[gvrettos]

Of course, ancient gods from Greek mythology could not be left outside of Greek translations, so I added them. 😉

Could you also annotate this PR with hacktoberfest-accepted label?

[what-the-diff]

PR Summary

• Expanded Collection of Ancient Greek God Names
  The el-GR locale has been enriched with a vast range of ancient Greek god names, enhancing the dimension of diversity and context. They are conveniently classified into three categories: ancient, primordial, and titan.

• Introduction of a 'Hero' Category
  A new segment named 'hero' has been integrated, presenting a plethora of famed names such as "Αχιλλέας", "Ηρακλής", and "Οδυσσέας". This addition will provide more options and depth when referring to heroic figures.

• Preservation of the 'Greek Philosophers' Section
  The current section that contains Greek philosophers hasn't been disturbed during this update, retaining titles like "Πλάτων". This helps to ensure that we are not losing information while adding more.

[kingthorin]

I’ll put together a fix for the test failure, it is unrelated to these changes.

[ForkJoinPool-1-worker-4] 22:46:34.129398 INFO [FakerIntegrationTest] Finished tests - OK (memory used:309, free:381, total:691, max:1792)
22:46:36.352 [ERROR] Failures: 
22:46:36.352 [ERROR]   UniversityTest.testName:16 
Expecting actual:
  "South Yost University of Liège"
to match pattern:
  "[A-Za-z'() ]+"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.21%. Comparing base (848dfe7) to head (c11dadf).
Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1404      +/-   ##
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+ Coverage     92.19%   92.21%   +0.01%     
  Complexity     3151     3151              
============================================
  Files           319      319              
  Lines          6152     6152              
  Branches        593      593              
============================================
+ Hits           5672     5673       +1     
+ Misses          336      334       -2     
- Partials        144      145       +1     

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