Add default list of http versions to request property bag (#1258)

* add: default list of http versions
add: type alias for list of http versions
add: decorator to add desired http versions to property bag
fix: gradle warning for argument "model"
update: CHANGELOG

* fix: clippy lint

* update: use more accurate name for test RustCodegenDecorators
rename: HttpVersionListGenerator.kt to HttpVersionListCustomization.kt
update: HttpVersionListCustomization to grab versions from models when possible
fix: various docs issues reported by IDE
add: new "Extras" section to ServiceConfig
update: code broke by "Extras" change
add: tests for http version sniffing