Squashed 'external/devlib/' changes from 2e5efb815..4fe9bb047

4fe9bb047 ftrace: Add write-to-disk mode
95df75062 connection: Support all signals in BackgroundCommand.send_signal()
d07cc5868 utils/asyn: Replace nest_asyncio with greenlet
3ada269ce utils/asyn: Factor out the calls to asyncio.run
9f5c19dad target: Allow reuse of a connection once the owning thread is terminated
f343642de tests: Add tests for nested async support
d63ea8e6e utils/asyn: Fix memoized_method.__set_name__
REVERT: 2e5efb815 ftrace: Add write-to-disk mode
REVERT: ee9317ec1 connection: Support all signals in BackgroundCommand.send_signal()
REVERT: b9d2317a6 utils/asyn: Replace nest_asyncio with greenlet
REVERT: 7e0c3e862 Revert "utils/asyn: Replace nest_asyncio with greenback"
REVERT: 3ca1bb105 utils/asyn: Replace nest_asyncio with greenback
REVERT: 83a566a49 utils/asyn: Factor out the calls to asyncio.run
REVERT: 54b39a403 target: Allow reuse of a connection once the owning thread is terminated
REVERT: 11fc36e7c tests: Add tests for nested async support

git-subtree-dir: external/devlib
git-subtree-split: 4fe9bb047f46b004953c0cb760f934c0e966c002