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

[EskiMojo14]

closes #4063

depends on #4056 or #4071

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@examples-lazy-injection/kitchen-sink	Configuration
rtk-esm-cra	Configuration

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size-limit report 📦

Path	Size
1. entry point: @reduxjs/toolkit (cjs, production.min.cjs)	14.11 KB (+0.07% 🔺)
1. entry point: @reduxjs/toolkit/react (cjs, production.min.cjs)	14.23 KB (+0.05% 🔺)
1. entry point: @reduxjs/toolkit/query/react (cjs, production.min.cjs)	24.46 KB (+0.29% 🔺)
2. entry point: @reduxjs/toolkit (without dependencies) (cjs, production.min.cjs)	7.5 KB (-0.03% 🔽)
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)	9.21 KB (-0.02% 🔽)
2. entry point: @reduxjs/toolkit/query/react (without dependencies) (cjs, production.min.cjs)	2.86 KB (-0.07% 🔽)