store.ts without dependencies

[sanderhahn]

Was looking at issue #2786 (Don't bundle the store) and this is just an idea/proposal. Because i am not sure what the unintended consequences are and if this would resolve them. This pull request makes store.ts independent of internal by inlining as workaround.

[Conduitry]

Inlining them is not what we want - this gives pretty much the exact same result as we already have now with bundling the store: stuff from internal is getting duplicated between internal and store. A short term fix is probably going to involve setting the external option on rollup when bundling. A longer term fix might be something like #2790.