Add enrollment status to the members overview

[ggwpez]

We could either add it here in a new column, or a new page that shows the current status of a member.
AFAIK a member can be:

• unimported
• imported
• inducted into the core pallet
• inducted into the salary pallet
• registered for the next salary payout

I think they can be treated as a linear progression from the first to the last state. It would be nice to show this state, so we can know which member has to still do some calls (if they want). cc @wirednkod

[Doordashcon]

We can probably do this using Subtx? Have members sign-in using polkadot-js and display the various status at the top of the Members page?

[wirednkod]

I want to introduce during this week P.API in the page.
The members page does not look good and I was thinking that maybe this can be implemented using the new Polkadot API as well