Sharing types with other repositories

We've been using `automat-client` in DCR. Over time it appears there's been a drift between the 'canonical' types here (in `support-dotcom-components`) and the types there (in `automat-client`) - for example the [`Targeting`](https://github.com/guardian/automat-client/blob/master/types.ts) type in `Metadata` (used for the ReaderRevenueEpic in DCR) doesn't include the required `hasOptedOutOfArticleCount` property, which means we have had to add a workaround in DCR where `automat-client` is consumed.

We felt that, rather than maintaining the types in two places, the types here in `support-dotcom-components` should be shared via a mechanism like an NPM package, and ingested by the other repositories.

Does this sound sensible?