v0.42.0

Many thanks to @ajfhs812, @andrew-d-jackson and @declanlscott for contributing to this release.

• Add metadata action to add custom metadata to a schema
• Add title metadata action to add a title to a schema (discussion #826)
• Add decimal action to validate integer and float strings (pull request #823)
• Rename decimal action to digits (pull request #823)
• Rename NoPipe type to SchemaWithoutPipe
• Fix inference of generics in IssueDotPath type (issue #814)