Implement new functions of NVIM API v7

[esensar]

Implement new functions added in NVIM API v7. These functions can be discovered using API Explorer from this project. All of this belongs to neovim-api module and wrappers need to be made in neovim-rx-api module for RxJava support.

• Functions:
  • nvim_set_decoration_provider - https://neovim.io/doc/user/api.html#nvim_set_decoration_provider()
  • nvim_ui_pum_set_bounds - https://neovim.io/doc/user/api.html#nvim_ui_pum_set_bounds()
  • nvim_get_hl_id_by_name - https://neovim.io/doc/user/api.html#nvim_get_hl_id_by_name()
  • nvim_set_hl - https://neovim.io/doc/user/api.html#nvim_set_hl()
  • nvim_exec_lua - https://neovim.io/doc/user/api.html#nvim_exec_lua()
  • nvim_notify - https://neovim.io/doc/user/api.html#nvim_notify()
  • nvim_get_runtime_file - https://neovim.io/doc/user/api.html#nvim_get_runtime_file()
  • nvim_get_all_options_info - https://neovim.io/doc/user/api.html#nvim_get_all_options_info()
  • nvim_get_option_info - https://neovim.io/doc/user/api.html#nvim_get_option_info()
  • nvim_echo - https://neovim.io/doc/user/api.html#nvim_echo()
  • nvim_open_term - https://neovim.io/doc/user/api.html#nvim_open_term()
  • nvim_chan_send - https://neovim.io/doc/user/api.html#nvim_chan_send()
  • nvim_exec - https://neovim.io/doc/user/api.html#nvim_exec()
• Methods:
  • nvim_buf_set_text - https://neovim.io/doc/user/api.html#nvim_buf_set_text()
  • nvim_buf_delete - https://neovim.io/doc/user/api.html#nvim_buf_delete()
  • nvim_buf_call - https://neovim.io/doc/user/api.html#nvim_buf_call()
  • nvim_buf_get_extmark_by_id - https://neovim.io/doc/user/api.html#nvim_buf_get_extmark_by_id()
  • nvim_buf_get_extmarks - https://neovim.io/doc/user/api.html#nvim_buf_get_extmarks()
  • nvim_buf_set_extmark - https://neovim.io/doc/user/api.html#nvim_buf_set_extmark()
  • nvim_buf_del_extmark - https://neovim.io/doc/user/api.html#nvim_buf_del_extmark()
  • nvim_win_hide - https://neovim.io/doc/user/api.html#nvim_win_hide()
  • nvim_win_call - https://neovim.io/doc/user/api.html#nvim_win_call()

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