Improve annotation of metabolites in models

[JHL-452b]

Current behavior:

As discussed in #728 , we had added SMILEs and Inchi to the metabolites in Human-GEM (./data/modelCuration/metabolites_SMILES_Inchi.tsv). This metabolite information allows us to enhance the metabolite annotation for Human-GEM by comparing it with other metabolite databases.
In this way, I found a total of 5946 matching items that should be included in metabolites.tsv. The distribution of these successfully matched items is as follows:

metBiGGID	metKEGGID	metHMDBID	metChEBIID	metPubChemID	metLipidMapsID	metMetaNetXID
New matched items	3	379	1915	844	1546	797

You can find more details in this New_metabolites.xls. It should be noted that the metabolite IDs in the MetaNetX database have been updated, and the previously matched metabolite IDs are no longer applicable. Thus, I updated the MetaNetX ID in the last column of the table.

Proposed changes:

• Add new annotation for metabolites and update the metabolites.tsv.