feat(gatsby-image): add types for gatsby-image/withIEPolyfill to fix #14592 (#14641)

* add types for gatsby-image/withIEPolyfill

* remove state generic

Author: janKir

packages/gatsby-image/withIEPolyfill/index.d.ts

@@ -0,0 +1,12 @@
+import * as React from "react"
+
+import GatsbyImage, { GatsbyImageProps } from "../index"
+
+interface GatsbyImageWithIEPolyfillProps extends GatsbyImageProps {
+  objectFit?: `fill` | `contain` | `cover` | `none` | `scale-down`
+  objectPosition?: string
+}
+
+export default class GatsbyImageWithIEPolyfill extends React.Component<
+  GatsbyImageWithIEPolyfillProps
+> {}