Allow `explode:true` for `style:pipeDelimited` and `style:spaceDelimited`

[charjr]

Result of OAI/OpenAPI-Specification#3737 (comment)

Also references the swagger query examples which suggest that explode:true is allowed for style:spaceDelimited andstyle:pipeDelimited but simply that it would look exactly like the default (style:form, explode:true)