support Object<T> as both input args and return type

[0xbe1]

See https://explorer.aptoslabs.com/account/0x1/modules/code/fungible_asset?network=devnet as an example that uses Object in many different places.

Regarding object serde, probably need to check aptos-core codebase to understand what's the expected behavior.

[SamuelQZQ]

@0xbe1 We have support Object as input. But we haven't tried any view function or account resource including Object type, we can add the Object as return type when figured it out.