Support for monorepo build is missing in @web/dev-server-storybook

[hardikpthv]

Currently when @web/dev-server-storybook is used in the Monorepo particularly with yarn workspaces in which the dependencies are managed centrally instead of package-level, the building of the storybook feature breaks on the following issue:

node_modules/@web/dev-server-storybook/node_modules/babel-plugin-bundled-import-meta/index.js:68
                                        throw new Error('Does not match any mappings or bundleDir.');

From quick investigation, the change in rollup base config, by adding support for packageDir, would fix the issue.

[bashmish]

We intend to deprecate @web/dev-server-storybook in favor of @web/storybook-builder.
Let's maybe pair up sometime this or next week and try a new @web/storybook-builder?
I think it should be better to monorepo.
I can make a prerelease for you with our internal config and addons and help to set it up. Actually curious how it's gonna work in a big project and monorepo, also how the migration scripts will work and such