pip installable versions of tesseract-ocr data

usually you'll want to pick a particular package for installation.

currently the following are provided (send a PR to add more!):

• tessdata.deu
• tessdata.eng
• tessdata.jpn
• tessdata.fast-deu
• tessdata.fast-eng
• tessdata.fast-jpn

these will install to {prefix}/share/tessdata -- you can access this directory path using the tessdata api:

import tessdata

print(tessdata.data_path())  # /path/to/venv/share/tessdata