[Feature]: Add .index() method

[shelegdmitriy]

What is your idea or feature suggestion?

The Social.index was one of the main use cases for the Social object on BOS, it would be super nice to port it into this package

Benefits

No response

Where can we find information about this?

https://thewiki.near.page/near.social_vm

Are you willing to provide a PR to address this?

None

[jaswinder6991]

Thanks @shelegdmitriy, we are adding .keys() and .index() methods using api server in the upcoming release after the v1.