Making the `crdt` package fully TypeScript-strict.

Upgrading murmurhash. The new version has TS types.

Apart from that, it looks pretty much the same.

Diff: https://www.diffchecker.com/CEpBedX1

Fix a small regression introduced in
https://github.com/actualbudget/actual/pull/1076

Tested locally and this seems to have solved the problem

I noticed that:

- The web and electron versions of our `uuid` module both looked exactly
the same…
- …and deferred to the `uuid` package…
- …and the async version just called the sync API.

So now we will just use the `uuid` package directly everywhere.

This significantly speeds up `yarn lint` for me. It also ensures we’re
listing all source files in the project, including the `.eslintrc` files
and any other files that may be present.

actual-server does not need to import the full actual-app/api package.
It can import only the CRDT stuff.. so I'm extracting it into a new
package to reduce the size of actual-server and make the link between
things more transparent.