Added Companion OAuth Key type (#4668)

Added the type for Companion OAuth keys in response to https://github.com/transloadit/uppy/issues/4664#issuecomment-1708924715

packages/@uppy/companion-client/types/index.d.ts

@@ -12,10 +12,16 @@ export interface TokenStorage {
 
 type CompanionHeaders = Record<string, string>
 
+type CompanionKeys = {
+  key: string,
+  credentialsName: string,
+}
+
 export interface RequestClientOptions {
   companionUrl: string
   companionHeaders?: CompanionHeaders
   companionCookiesRule?: RequestCredentials
+  companionKeysParams?: CompanionKeys
 }
 
 type RequestOptions = {