Enable customCryptoAdapter on create client

[Jonatthu]

This enables react native to switch methods across platforms!

Just like storage adapter

const supabase = createClient(
     'https://xyzcompany.supabase.co',
     'public-anon-key',
     options: {
       ...
       auth: {
         ...
         detectSessionInUrl: true,
         flowType: 'pkce',
         storage: customStorageAdapter, <--------
       }
       ...
     }
)

We need one for crypto, on react native for example Crypto web api's are not supported, for that we need a package like expo-crypto so we can enable state code challenge method sh256 and not plain which is insecure for oauth.