Squashed 'external/devlib/' changes from 3e45a2298..c30eb537b

c30eb537b utils/asyn: Ensure the async generators inside context managers are fully consumed on a single event loop
277e0fcfb utils/asyn: Replace nest_asyncio with greenlet
103748b9c Revert "utils/asyn: Replace nest_asyncio with greenback"
bf16f34bd utils/asyn: Replace nest_asyncio with greenback
83f25393e utils/asyn: Factor out the calls to asyncio.run
00a8e9b05 target: Allow reuse of a connection once the owning thread is terminated
c86853d3c tests: Add tests for nested async support

git-subtree-dir: external/devlib
git-subtree-split: c30eb537b197cf2ad5acaf44e6b9a6b120690a45