[FR] Enhance Text-Corpora Analysis

[HarikalarKutusu]

Fix multiple problems/needs at once:

• [DONE in Analyzer v0.13.0] The data in $text_corpus_stats.* data is rather large, so dividing them under languages is needed. The analyzer only works per language-version of the dataset anyway.
• [DONE in Analyzer v0.13.0] Although new text corpus data is not exported to the git repo, older ones are there and can be reached by git tools. So we can get the data at a specific commit and analyze it. This way we can see the changes in time.
• [DONE in Analyzer v0.13.0] Add more analysis
  • Grapheme distribution
  • Phoneme distribution (if supported)
• Analyze text corpus usage in the buckets/splits wrt the above extracted text-corpus

[HarikalarKutusu]

Implemented in #33