feat: OpenAPI 3.1 support (#8367)

- New top-level field - `webhooks`. This allows describing out-of-band webhooks that are available as part of the API.

- New top-level field - `jsonSchemaDialect`. This allows defining of a default `$schema` value for Schema Objects

- The Info Object has a new `summary` field.

- The License Object now has a new `identifier` field for SPDX licenses. This `identifier` field is mutually exclusive with the `url` field. Either can be used in OpenAPI 3.1 definitions.

- Components Object now has a new entry `pathItems`, to allow for reusable Path Item Objects to be defined within a valid OpenAPI document.

- `License` and `Contact` components are now exported and available via `getComponent`

- New version predicates and selectors for `isOpenAPI30` and `isOpenAPI31`. This avoids needing to change the usage of `isOAS3` selector.

- New OAS3 components: `Webhooks`

- New OAS3 wrapped components: `Info`, `License`

src/core/plugins/oas3/helpers.jsx

@@ -1,16 +1,27 @@
 import React from "react"
 
+export function isOpenAPI30(jsSpec) {
+  const oasVersion = jsSpec.get("openapi")
+  if (typeof oasVersion !== "string") {
+    return false
+  }
+  return oasVersion.startsWith("3.0.") && oasVersion.length > 4
+}
+
+export function isOpenAPI31(jsSpec) {
+  const oasVersion = jsSpec.get("openapi")
+  if (typeof oasVersion !== "string") {
+    return false
+  }
+  return oasVersion.startsWith("3.1.") && oasVersion.length > 4
+}
+
 export function isOAS3(jsSpec) {
   const oasVersion = jsSpec.get("openapi")
   if(typeof oasVersion !== "string") {
     return false
   }
-
-  // we gate against `3.1` because we want to explicitly opt into supporting it
-  // at some point in the future -- KS, 7/2018
-
-  // starts with, but is not `3.0.` exactly
-  return oasVersion.startsWith("3.0.") && oasVersion.length > 4
+  return isOpenAPI30(jsSpec) || isOpenAPI31(jsSpec)
 }
 
 export function isSwagger2(jsSpec) {