Add custom id support for Subscribe and Unsubscribe

Change encoding to UTF8

Add Custom Yield Instruction for GraphQLClient.Send

Deprecate inconsistent GraphQL methods
update package

Refactor param orders of SendAsync and SubscribeAsync to reduce confu…

…sion and unnecessary passing of auth tokens/schemes

AuthScheme is now null by default (no need to be Bearer by default)
AuthToken and AuthScheme now appear after everything

Fix AuthScheme being ignored in SendAsync