* libwaku: Avoid global variable and changing callback signature
* Better signature for the callback. Two new parameters have been added:
one aimed to allow passing the caller result code; the other
param is to pass an optional userData pointer that might need
to be linked locally with the Context object. For example, this is needed
in Rust to make the passed closures live as
long as the Context.
* waku_example.c: adaptation to the latest changes
* libwaku.h: removing 'waku_set_user_data' function
* libwaku.nim: renaming parameter in WakuCallBack (isOk -> callerRet)
* 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.
* libwaku: create the WakuNode in the Waku thread. Not in the main thread
* node_lifecycle_request.nim: moving hard-coded value to a const item
* libwaku.nim: start using 'isOkOr' instead of 'isErr()'-approach
* node_lifecycle_request.nim: better 'async' & 'await' usage. Not block the runtime
Ivan FB
Hanno Cornelius