STEllAR-GROUP / hpx / #805

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Merge #6015

6015: Integrating sync_wait & sync_wait_with_variant r=hkaiser a=hcq9102

## Proposed Changes:
Ref: [P2300R5](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2300r5.html#example-schedulers)
Integrate sync_wait and sync_wait_with_variant.

## Checklist

-  I have added a new feature and have added tests to go along with it.


Co-authored-by: chuanqiu <chuanqiuhe@gmail.com>
Co-authored-by: Hartmut Kaiser <hartmut.kaiser@gmail.com>

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