Enable CSRF protection in grant (OAuth2)

I've been doing some testing and from what I can see, this is already supported in https://github.com/simov/grant (which companion uses for OAuth2), when enabling the `state` parameter. It seems to be working and it is checking the parameter when redirected back from the provider: https://github.com/simov/grant/blob/61fe48a8dac6aa4ec5764fadff0898b743b85588/lib/flow/oauth2.js#L72So

packages/@uppy/companion/src/config/grant.js

@@ -1,6 +1,4 @@
 const google = {
-  transport: 'session',
-
   // access_type: offline is needed in order to get refresh tokens.
   // prompt: 'consent' is needed because sometimes a user will get stuck in an authenticated state where we will
   // receive no refresh tokens from them. This seems to be happen when running on different subdomains.
@@ -15,51 +13,59 @@ const google = {
   "scope_delimiter": " "
 }
 
+const defaults = {
+  transport: 'session',
+  state: true, // Enable CSRF check
+};
+
 // oauth configuration for provider services that are used.
 module.exports = () => {
   return {
     // we need separate auth providers because scopes are different,
     // and because it would be a too big rewrite to allow reuse of the same provider.
     googledrive: {
+      ...defaults,
       ...google,
+      state: true,
       callback: '/drive/callback',
       scope: ['https://www.googleapis.com/auth/drive.readonly'],
     },
     googlephotos: {
+      ...defaults,
       ...google,
       callback: '/googlephotos/callback',
       scope: ['https://www.googleapis.com/auth/photoslibrary.readonly', 'https://www.googleapis.com/auth/userinfo.email'], // if name is needed, then add https://www.googleapis.com/auth/userinfo.profile too
     },
     dropbox: {
-      transport: 'session',
+      ...defaults,
       authorize_url: 'https://www.dropbox.com/oauth2/authorize',
       access_url: 'https://api.dropbox.com/oauth2/token',
       callback: '/dropbox/callback',
       custom_params: { token_access_type : 'offline' },
     },
     box: {
-      transport: 'session',
+      ...defaults,
       authorize_url: 'https://account.box.com/api/oauth2/authorize',
       access_url: 'https://api.box.com/oauth2/token',
       callback: '/box/callback',
     },
     instagram: {
-      transport: 'session',
+      ...defaults,
       callback: '/instagram/callback',
     },
     facebook: {
-      transport: 'session',
+      ...defaults,
       scope: ['email', 'user_photos'],
       callback: '/facebook/callback',
     },
     // for onedrive
     microsoft: {
-      transport: 'session',
+      ...defaults,
       scope: ['files.read.all', 'offline_access', 'User.Read'],
       callback: '/onedrive/callback',
     },
     zoom: {
-      transport: 'session',
+      ...defaults,
       authorize_url: 'https://zoom.us/oauth/authorize',
       access_url: 'https://zoom.us/oauth/token',
       callback: '/zoom/callback',