Add CI/CD for retrieving and building ontologies into rustyms

[wfondrie]

This PR add a GitHub action to automate the download and serialization of the required ontologies for building rustyms.

[wfondrie]

Here's the most recent glycan error:

error: Invalid iupac monosaccharide name
    ╷
476 │ G00023PO,"Qui2
    ·              ‾‾‾
    ╵
This name could not be recognised as a standard iupac glycan name
error: Invalid iupac monosaccharide name
    ╷
479 │ G00063TX,"Fuc2
    ·              ‾‾‾
    ╵
This name could not be recognised as a standard iupac glycan name
error: Invalid iupac monosaccharide name
    ╷
538 │ G00006RP,"D-Araf2
    ·                 ‾‾‾
    ╵
This name could not be recognised as a standard iupac glycan name
error: Invalid iupac monosaccharide name
    ╷
539 │ G00028ZX,"Hex2F4
    ·                ‾‾‾
    ╵
This name could not be recognised as a standard iupac glycan name
error: Invalid iupac monosaccharide name
    ╷
541 │ G00053UV,"D-Ara2
    ·                ‾‾‾
    ╵
This name could not be recognised as a standard iupac glycan name
thread 'main' panicked at rustyms-generate-databases/src/../../rustyms/src/shared/glycan.rs:377:24:
index out of bounds: the len is 2 but the index is 2
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[wfondrie]

Alright, I think this is ready to go! Check out #61 just to make sure.