Add more comprehensive constraints, common typedefs, to OAS spec

[cd-rite]

• Add more keywords to better describe expected requests:
  • add uniqueItems: true and minItems: 1 for arrays where appropriate
• restrict string lengths where currently left unbound
• Define common types for items that appear in multiple schemas:
  • ie. define a StatusText type to replace instances where the text property of a status object is defined String512Nullable in-line.
  • same for ruleId, benchmarkId, etc.
  • BenchmarkId is already defined (but as a string. look to database columns for size reference), and it isn't actually used in any schema definitions.
  • Some definitions conflict... Rule title is defined as StringMax in some spots and string in others, but in the db it's varchar(1000)

[csmig]

Closed by #1257