* squashing work on using cancellation in nym crates
making nym-task wasm compilable
removed sending of status messages
replaced TaskManager with ShutdownManager in the validator rewarder
additional helpers for ShutdownManager
simplified ShutdownToken by removing the name field
TaskClient => ShutdownToken within all client tasks
wip: remove TaskHandle
* track all long-living client tasks
* add task tracking for most top level tasks within nym-node
* improved default builder
* split up cancellation module
* module documentation and unit tests
* nym node fixes and naming consistency
* wasm fixes
* assert_eq => assert
* wasm fixes and made 'run_until_shutdown' take reference instead of ownership
* linux-specific fixes to IpPacketRouter
* post rebasing fixes for signing monitor
* add ShutdownManager constructor to build it from an external token
* applying PR review suggestions
Jędrzej Stuczyński
0ee387d983