use external stdexec package

Add subprojects/stdexec.wrap so that we can use upstream stdexec,
if the packageconfig is unavailable, and reference it as necessary
in the meson.build.

Signed-off-by:

use external stdexec package

Add subprojects/stdexec.wrap so that we can use upstream stdexec,
if the packageconfig is unavailable, and reference it as necessary
in the meson.build.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic0f32f694aac2f98c9646168b08ca352c183afa1

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