[datasets] Massively extend the pre-defined vocabs

[felixdittrich92]

This PR:

• Extend the pre-defined vocabs
• Sort datasets.rst to the same order we have in vocabs.py

NOTE:

• I evaluated that every single character has a font (google fonts) which supports it and additionally that the char can be rendered correctly - and does not render a 𱃱 - "placeholder" char

CC @sebastianMindee This was a f***ing pain .. especially the non cyrillic / latin ones 😅 - list is created with an combination of chatgpt + gemini + lots of manual / semi-automated evaluation (wikipedia & unicode table & other sources)

Total unique characters in VOCABS: 20814
VOCABS characters supported by at least one font: 20814
VOCABS characters NOT supported by any font: 0

Overwrites: #1925 #1926

Closes: #1883

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.83%. Comparing base (559279d) to head (dd00b4c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1928      +/-   ##
==========================================
+ Coverage   96.76%   96.83%   +0.06%     
==========================================
  Files         172      172              
  Lines        8442     8520      +78     
==========================================
+ Hits         8169     8250      +81     
+ Misses        273      270       -3     

Flag	Coverage Δ
unittests	96.83% <100.00%> (+0.06%)	⬆️

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[felixdittrich92]

@sebastianMindee

should be mostly fine (I think east asian vocabs needs some adjustments in a follow up PR)

[felixdittrich92]

Closes: #1935