Investigate if new hard enforced BIS rules can be added with a new version of the EC spec

[ColinKerr]

There are currently rules we wish we could enforce but we cannot enforce because there are existing schemas out there that break those rules.

Consider using the new EC spec versions as a way to add new enforced rules. A new EC spec can enforce new EC rules so the original EC spec version must already be preserved when the schema is round tripped. This means we can always tell the original spec version used to define a schema and so it can serve as a flag to turn on new BIS rules hard enforced rather than just a unenforced validation issue.