Use external Package for FHI-aims IO interface (#4260)

* Update FHI-aims io to use pyfhiaims

* Update si for file format changes

consistent number of #

* update ref file with blank line in header

* Update for new parsers

* Replace where AimsParseError is located

updating parsers

* Add modified converters interface.

Move that to pyfhiaims

* Update for pyfhiaims parsers

* Updates from pyfhiaims cleanups

* update tests for new interface

restults seemed to have change, so fixing that

* fix things for atomate2

* modify pyproject.toml

Add optional aims reqirement of pyfhiaims

* Add importorskip line for pyfhiaims

Should skip aims test without the optional dependency

* Remove FHI-aims test files

Tests will be done in pyfhiaims as per @shyuep request

* fix build errors

aims not apart of optional as it's not needed in tests

* Add pymatgen-io-aims to the add on's page

* FHI-aims now in add on

remove copied files from the add on

Author: tpurcell90