feat: added network notice banner as a resuable component

[frazarshad]

closes: #114

Description

This PR adds NetworkBanner (originally implemented in this PR) as a reusable component for dapps. The purpose of this component is to query the /network-config endpoint to find any notices and display them.

The use of this component dapp-econ-gov can be seen in this PR https://github.com/Agoric/dapp-econ-gov/pull/104

How to test

• copy dapp-econ-gov and ui-kit repos and checkout to the ` andfeat/notice-banner` branch respectively
• run yarn build in the ui-kit repo to create the dist directory
• run yarn add /full/path/to/ui-kit/packages/react-components in dapp-econ-gov to install it as a dependancy.

Security Considerations

Scaling Considerations

Documentation Considerations

Testing Considerations

[samsiegart]

In reference to https://github.com/Agoric/dapp-psm/pull/94, I'm having trouble testing with yarn link as well (probably since we updated to yarn v4). I'm eager to put an example dapp in this package (https://github.com/Agoric/ui-kit/issues/86) so we can test new components easier.

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[frazarshad]

In reference to Agoric/dapp-psm#94, I'm having trouble testing with yarn link as well (probably since we updated to yarn v4). I'm eager to put an example dapp in this package (#86) so we can test new components easier.

yarn link was also troublesome for me. i've added instructions in the description on how to test these changes

[frazarshad]

Can you add the issue to the PR description please? It would be helpful to see the requirements.

No issue exists previously. created one and linked it in the PR