Add more metadata to EC entries

[cmungall]

Compare https://www.enzyme-database.org/query.php?ec=1.1.1.1

with:

✗ curl -L -s https://w3id.org/biopragmatics/resources/eccode/eccode.obo | obo-grep.pl -r 'id: eccode:1.1.1.1\n' - | grep -v ^rel

[Term]
id: eccode:1.1.1.1
name: alcohol dehydrogenase
is_a: eccode:1.1.1 ! With NAD(+) or NADP(+) as acceptor
synonym: "aldehyde reductase" EXACT []

ideally:

• reaction captured as a definition
• comments captured
• other names + systematic name captured
• systematic name captured using an OMO synonym type

cc @balhoff