OpenAPI 3.1.0 support: Encoding Object now supports `style`, `explode` and `allowReserved` for the multipart/form-data

[char0n]

In OpenAPI 3.1.0, the Encoding Object now supports style, explode and allowReserved for the multipart/form-data media type as well.

OpenAPI 3.0.x

OpenAPI 3.1.0

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The goal of this issue is to figure out what are the implications for swagger-js and swagger-ui and implement the support for above mentioned changes.