fix(useRequest): infer data type from services that return a promise chain

[jamalkamaladdin]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
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• TypeScript definition update
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🔗 Related issue link

Fixes #2965.

💡 Background and solution

useRequest.ts: first overload constrains TService to a function returning any, and its service parameter has type TService & AnyService.
useRequest(() => Promise.resolve(1).then((x) => x)) gives data as number, not any.
A service returning a non-promise fails to compile.
index.spec.ts: type and runtime case for a service returning a promise chain.

📝 Changelog

English: useRequest infers data from a service returning promise.then(...).

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed