factor higher-order client-utils kits with increasing functionality

[turadg]

What is the Problem Being Solved?

We have these increasingly higher order utilities in @agoric/client-utils:

• Vstorage
• VstorageKit
• SmartWalletKit

The last one includes agoricName which requires fetching them from the board, but it also requires delay which is a power not needed for fetching from agoric names.

Description of the Design

There should be an intermediate like BoardKit wrapping VstorageKit and contained in SmartWalletKit.

It should be synchronously constructible. The data will be made available either by an imperative function like load() or by maing all the data access a promise.

The constructors should make it easy to compose these kits from each other, or to make one from scratch that creates the whole chain.

Separately it would be good to abstract being able to pass in delay or setTimeout. We could have an @agoric/internal utility to handle either.

Security Considerations

Scaling Considerations

Test Plan

Upgrade Considerations

[dckc]

should be synchronously constructible.

yes!