Feat: Allow to set identity for the pool account

[mustermeiszer]

Description

We want to be able to allow a PoolAdmin to create an identity for the main pool account that we are deriving from the pool id. See old ticket here.

The problem is that pallet-identity does not provide interaction with it, besides using the extrinsic interface. As this interface expects a RuntimeOrigin::signed(AccountId) and places looks on the account for deposits we have to create a wrapper call as the derived account can not sign.

Steps

• Create a set_pool_identity() extrinsic in the pallet-pool-registry
  • Only callable by PoolAdmin
• Interface should allow to call

   pub fn set_identity(
     origin: OriginFor<T>,
     info: Box<IdentityInfo<T::MaxAdditionalFields>>,
  ) -> DispatchResultWithPostInfo {

  afterwards.
• Use Origin::signed(PoolAccount) as the origin for the call
• Move deposit from pool-admin account to PoolAccount beforehand

Research/based on

Issuers needs to display the accounts nicely on subscan et. al.

How will this affect the code base

Enhance usability for issuers.

What are foreseen obstacles or hurdles to overcome?

• Chaning identities not yet thought about