feat(providers): Add Encrypted from cozy-viewer

and remove it from there

react/providers/Encrypted/index.jsx

@@ -0,0 +1,25 @@
+import React, { useContext } from 'react'
+
+export const EncryptedContext = React.createContext()
+
+export const useEncrypted = () => {
+  const context = useContext(EncryptedContext)
+
+  if (!context) {
+    throw new Error('useEncrypted must be used within a EncryptedProvider')
+  }
+  return context
+}
+
+const EncryptedProvider = ({ url, children }) => {
+  const contextValue = {
+    url
+  }
+  return (
+    <EncryptedContext.Provider value={contextValue}>
+      {children}
+    </EncryptedContext.Provider>
+  )
+}
+
+export default React.memo(EncryptedProvider)