Add example of lazy loading slices with combineSlices, and middleware with createDynamicMiddleware

[EskiMojo14]

closes #4063

depends on #4056 or #4071

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size-limit report 📦

Path	Size
1. entry point: @reduxjs/toolkit (cjs, production.min.cjs)	14.1 KB (+0.04% 🔺)
1. entry point: @reduxjs/toolkit/react (cjs, production.min.cjs)	14.23 KB (+0.04% 🔺)
1. entry point: @reduxjs/toolkit/query (cjs, production.min.cjs)	21.99 KB (+0.02% 🔺)
1. entry point: @reduxjs/toolkit/query/react (cjs, production.min.cjs)	24 KB (+0.24% 🔺)
2. entry point: @reduxjs/toolkit (without dependencies) (cjs, production.min.cjs)	7.5 KB (-0.08% 🔽)
2. entry point: @reduxjs/toolkit/react (without dependencies) (cjs, production.min.cjs)	509 B (+0.6% 🔺)
2. entry point: @reduxjs/toolkit/query (without dependencies) (cjs, production.min.cjs)	8.8 KB (+0.06% 🔺)
2. entry point: @reduxjs/toolkit/query/react (without dependencies) (cjs, production.min.cjs)	2.75 KB (-0.11% 🔽)