Improve registry approach

[ronaldtse]

Can we use some sort of textual switch for each pubid flavor to register themselves?

e.g.

• pubid-iso registers the prefix "ISO"
• pubid-iec registers the prefix "IEC"
• etc

Then it's much easier to find the correct flavor.

Originally posted by @ronaldtse in https://github.com/metanorma/pubid/issues/6#issuecomment-1991481370

[mico]

@ronaldtse There are exceptions for ISO where identifier doesn't start with "ISO", some examples:

• IEC/DPAS 63086-3-1
• IEEE/ISO/IEC 8802-1Q-2020
• IWA 8:2009
• FprISO 105-A03
• GUIDE ISO/CEI 71:2001(F)"
• Руководство ИСО/МЭК 76
• ИСО/ПМС 1956/2 (Russian ISO identifier)
• AWI IWA 36

Same with IEC (just few examples):

• PWI 100-44 ED1
• ISO/IEC VIM:1993
• CISPR 15:2013/ISH2:2013

For IEEE:

• ANSI C37.0781-1972
• ASA C37.1-1950
• AIEE No 91-1962 (ASA Y32.14-1962)
• IEC 61671-2 Edition 1.0 2016-04
• ISO/IEC 15288 First edition 2002-11-01
• PC57.158/D6A, August 2016
• ASA C37.1-1937 (Reaffirmed 1945) (a lot more exceptions for IEEE)

For NIST it's always "NBS" or "NIST". If we don't need to take care of these exceptions, I think it's fine to find matching gem just by prefix, but we also can go through pubid-iso/iec/ieee in case if match was not found or parsing was failed.