feat(ux): show file upload when schema has "format: base64"

According to
#7325 (comment)
the uploaded file should be converted to base64 automatically.

Author: neiser

src/core/plugins/oas3/components/request-body.jsx

@@ -108,13 +108,15 @@ const RequestBody = ({
 
   const isObjectContent = mediaTypeValue.getIn(["schema", "type"]) === "object"
   const isBinaryFormat = mediaTypeValue.getIn(["schema", "format"]) === "binary"
+  const isBase64Format = mediaTypeValue.getIn(["schema", "format"]) === "base64"
 
   if(
     contentType === "application/octet-stream"
     || contentType.indexOf("image/") === 0
     || contentType.indexOf("audio/") === 0
     || contentType.indexOf("video/") === 0
     || isBinaryFormat
+    || isBase64Format
   ) {
     const Input = getComponent("Input")