feat: query smart wallet auto-provision fee

[samsiegart]

refs https://github.com/Agoric/ui-kit/issues/78

This queries the smart wallet auto-provision fee in the wallet connection component, and exposes it in the react useAgoric hook as well.

Also fixed a bug where the purse notifier was updating every time the bank was polled, even if the balances didn't change. (cc @0xpatrickdev)

Testing

Tested on this branch of dapp-offer-up: https://github.com/Agoric/dapp-offer-up/compare/test-network-dropdown

Steps:

• Build ui-kit with yarn && yarn workspaces run prepack
• Set up link with cd packages/react-components && yarn link
• Clone dapp-offer-up and checkout this branch: https://github.com/Agoric/dapp-offer-up/compare/test-network-dropdown
• Start the local chain with docker (the offer-up contract doesn't necessarily have to be deployed to test this functionality, just a local chain)
• Link the local version of this packages in dapp-offer-up: cd ui && yarn link @agoric/react-components
• Run the local UI: cd ui && yarn && yarn dev
• Try modifying the dapp to read the provision fee: const { smartWalletProvisionFee } = useAgoric()
• Observe after connecting to wallet that the provision fee is accessible

For an e2e example with the provision dialog, see https://github.com/Agoric/ui-kit/pull/99

[LuqiPan]

@samsiegart could you help me and other reviewers understand what tests have you done on this PR?

[samsiegart]

@samsiegart could you help me and other reviewers understand what tests have you done on this PR?

Sure yea, just updated the PR description. Lmk if you'd like more clarification or want to walk through it together. We're pretty close to being able to set up an example dapp in this repo with e2e testing, which would make this type of thing easier to test.