* bump_dependencies.md: add nim-results dependency
* change imports stew/results to results
* switching to Nim 2.0.8
* waku.nimble: reflect the requirement nim 1.6.0 to 2.0.8
Adding --mm:refc as nim 2.0 enables a new garbage collector that we're
not yet ready to support
* adapt waku code to Nim 2.0
* gcsafe adaptations because Nim 2.0 is more strict
* Thread-safe comms between main thread & Waku Thread - ChannelSPSCSingle.
* Renaming procs from 'new' to 'createShared'. They use the shared allocator.
* peer_manager_request: no need to use ptr WakuNode.
* waku_thread: moving the 'waitFor' to upper layer.
* waku_thread: `poll()` -> `waitFor sleepAsync(1)` to avoid risk of blocking.
* libwaku: thread-safe "sub-objects" in an inter-thread requests.
When two threads send data each other, that data cannot contain any
GC'ed type (string, seq, ref, closures) at any level.
* Allocating the 'configJson' in main thread and deallocating in Waku Thread.
