Add a host option to MFE generator to allow a remote to specify a host that it should be consumed
by.
Use this value to update the host application's webpack.config,js
Previously, naming convention of consuming applications for MFEs was `shell`.
Change it to match Webpack Module Federation's naming convention of calling it `host`.
BREAKING CHANGE:
The `mfeType` options have changed from `shell | remote` to `host | remote`.
