Consider dynamic imports for plugin dependencies

[kanej]

When defining the dependencies of a plugin it would be better if the dependency was dynamically imported rather than forcing the loading of the plugin as happens currently:

import hardhatIgnitionPlugin from "@ignored/hardhat-vnext-ignition"

export default {
  id: PLUGIN_ID,
  npmPackage: "@ignored/hardhat-vnext-ignition-viem",
  dependencies: [
    async () => hardhatIgnitionPlugin
  ]
}