Switch to yarn PnP

[petersalas]

This switches the yarn linker to PnP. The impetus is to avoid this problem: yarnpkg/yarn#8540 (comment)

(CRA sets restrictions on what aliases can be used within webpack, so I wasn't able to get the webpack workaround to work.)

There are a few side-effects of this change:

• We need to be more explicit about our dependencies in a few places where we were importing transitive dependencies
• VSCode needs to be configured to use yarn's version of things as per https://yarnpkg.com/getting-started/editor-sdks
• eslint-plugin-import needs to use https://yarnpkg.com/features/pnp#fallback-mode as per https://psidium.github.io/lerna/monorepo/yarn/nodejs/pnp/zero-install/2021/08/23/migrating-a-monorepo-from-lerna-to-yarn-3.html
• tsx doesn't work with PnP on Node 18 until feat(esm): leverage loaders when resolving subsequent loaders nodejs/node#43772 is backported, so this switches the example package away from tsx
• I needed to inject some fake peerDependencies into postcss-loader via packageExtensions

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