Squashed 'external/devlib/' changes from e1407127e..5b04f1f6b

5b04f1f6b ftrace: Add write-to-disk mode
1ede4c92f connection: Support all signals in BackgroundCommand.send_signal()
332d32bf0 utils/asyn: Ensure the async generators inside context managers are fully consumed on a single event loop
d0f2cec9d utils/asyn: Replace nest_asyncio with greenlet
afa490d36 Revert "utils/asyn: Replace nest_asyncio with greenback"
d97c798a5 utils/asyn: Replace nest_asyncio with greenback
071cc6f3c utils/asyn: Factor out the calls to asyncio.run
103428de6 target: Allow reuse of a connection once the owning thread is terminated
58613fc79 tests: Add tests for nested async support
bbdd2ab67 target: Properly propagate ADB port information
38d4796e4 utils/ssh: Allow passing known_hosts path via strict_host_check value
REVERT: e1407127e ftrace: Add write-to-disk mode
REVERT: 81674b046 connection: Support all signals in BackgroundCommand.send_signal()
REVERT: 1c1e860e9 utils/asyn: Ensure the async generators inside context managers are fully consumed on a single event loop
REVERT: 9cab4713c utils/asyn: Replace nest_asyncio with greenlet
REVERT: 7e0e7442c Revert "utils/asyn: Replace nest_asyncio with greenback"
REVERT: c9178d20a utils/asyn: Replace nest_asyncio with greenback
REVERT: 22df0fb7c utils/asyn: Factor out the calls to asyncio.run
REVERT: 02f030936 target: Allow reuse of a connection once the owning thread is terminated
REVERT: a5d2411e9 tests: Add tests for nested async support

git-subtree-dir: external/devlib
git-subtree-split: 5b04f1f6bbda72431ccf85a9062c860628acecd9