fix: improve data package types

[johnhooks]

What?

This commit improves the types in the data package.

• Adds new types ThunkArgs and Thunk. These types are intended to be used by consumers of the data package to define their own thunks.
• Adds the dispatch and select functions to the DataRegistry type.
• Adds the invalidate action creators to the ActionCreatorsOf type.

Why?

This allows consumers of the data package to have more complete type safety. Also, provides access to the invalidate resolution action creators, which are useful for complex data store manipulation.

How?

Adding new types as described above.

Testing Instructions

Building the package types.

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[johnhooks]

Example of usage:

import type { ThunkArgs } from "@wordpress/data";

import type { Action, Store, Item } from "./types";

export const receiveItem =
  (item: Item) =>
  async ({ dispatch, select, registry }: ThunkArgs<Action, Store>) => {
    // In this function `dispatch` and `select` are fully typed to the store and action types,
    // `registry` is fully typed, if given a fully typed store descriptor.
  };