* Improve code coverage of `@atproto/lex-data` tests
* Improve typing of `@atproto/syntax` type assertion utilities
* Improve performance of `@atproto/lex-schema ` string format checking
* Remove `assertX` string format assertion utilities
* tidy
* tidy
* Rename `isLanguageString` to `validateLanguage`
* add string format utils
* tidy
* Refactor uri validation to use `@atproto/syntax`
* More language validation to @atproto/syntax
Matthieu Sieben