Added the receiver CPOs (set_value, set_error, set_stopped)#6

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dietmarkuehl wants to merge 6 commits intomainfrom receiver

+1,221-21

Commits on Jan 31, 2022

added set_stopped
dietmarkuehl
committed

Commits on Feb 5, 2022

added set_error implementation
dietmarkuehl
committed

Commits on Feb 6, 2022

Commits on Feb 7, 2022

addressed review comments
dietmarkuehl
committed