Defines the structs for each type of CLDR transform rule.
Transform rules are defined by the CLDR specification and include the following types:
Unicode.Transform.Rule.Comment— comment linesUnicode.Transform.Rule.Filter— global filter rules restricting which characters are affectedUnicode.Transform.Rule.Transform— transform directives (e.g.,:: NFD ;)Unicode.Transform.Rule.Definition— variable definitions (e.g.,$var = value ;)Unicode.Transform.Rule.Conversion— conversion rules with direction, context, and revisit