fetchBaseQuery: expose extraOptions to prepareHeaders

[phryneas]

Triggered by #4290 and the fact that we had similar asks before. Not sure if the extra generic arg is worth it. Thoughts, @EskiMojo14 & @markerikson ?

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size-limit report 📦

Path	Size
1. entry point: @reduxjs/toolkit/query/react (cjs, production.min.cjs)	23.95 KB (+0.06% 🔺)
3. fetchBaseQuery (.modern.mjs)	5.09 KB (+0.25% 🔺)

[phryneas]

Would you prefer it like this or without the generic and just unknown? 🤔

[EskiMojo14]

definitely the generic