feat: add useRuntimeContext api data structure

[zllkjc]

Summary

1. add context field in useRuntimeContext return value, the same as inhouse framework.
2. add TSSRBaseContext for the context field.
3. remove useless export BaseRuntimeContext.
4. pickedContext should not be assigned extra field, so we remove [key: string]: any in TRuntimeContext, and use TRuntimeContext instead BaseTRuntimeContext.

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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Latest commit: d04128f

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