CLDR-17661 ii: add yiii numbering system

[srl295]

• this is just a draft
• this is NOT how Yiii numbers work, but just to test the mechanism.

CLDR-17661

• [ ] This PR completes the ticket.

ALLOW_MANY_COMMITS=true

[jira-pull-request-webhook[bot]]

Notice: the branch changed across the force-push!

• common/bcp47/number.xml is different

View Diff Across Force-Push

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[srl295]

The issue is being closed as needs-more-information at the submitter's request.