core: add a python provider configuration

Co-Authored-by: iGor milhit <igor@milhit.ch>

lua/core/init.lua

@@ -1,3 +1,4 @@
 -- Load all module files
+require("core.python-provider")
 require("core.keymaps")
 require("core.options")

lua/core/python-provider.lua

@@ -0,0 +1,4 @@
+-- Set a virtualenv as python provider
+--  https://neovim.io/doc/user/provider.html#python-virtualenv
+
+vim.g.python3_host_prog = "/home/igor/.pyenv/versions/py-nvim3.10/bin/python"