add package_python.sh and setup.py.template

[hiroshi-matsuda-rit]

@kazuma-t Could you review this packaging script for python? It's simple and will take few minutes.

It generates three types of packages:

• SudachiDict_small
• SudachiDict_core
• SudachiDict_full

I used python 3.7.2 for testing.

[hiroshi-matsuda-rit]

By the way, I suppose that SudachiPy should refer one of the SudachiDict_* pacakages as the default dictionary. My opinion is:

• the order of the default dictionary is SudachiDict -> SudachiDict_core
• Run sudachipy --set_default_dic (small|core|full) if a user wants to use SudachiDict_(small|full) as the default dictionary

I'd like to add this option to SudachiPy if you agree. > @kazuma-t @izziiyt