fix log libwaku (#3608)

* libwaku properly set a default log config
* waku_example.c set numShardsInNetwork to 257

examples/cbindings/waku_example.c

@@ -298,6 +298,7 @@ int main(int argc, char** argv) {
     snprintf(jsonConfig, 5000, "{ \
                                     \"clusterId\": 16, \
                                     \"shards\": [ 1, 32, 64, 128, 256 ], \
+                                    \"numShardsInNetwork\": 257, \
                                     \"listenAddress\": \"%s\",    \
                                     \"tcpPort\": %d,        \
                                     \"relay\": %s,       \

library/waku_context.nim

@@ -5,6 +5,7 @@
 import std/[options, atomics, os, net, locks]
 import chronicles, chronos, chronos/threadsync, taskpools/channels_spsc_single, results
 import
+  waku/common/logging,
   waku/factory/waku,
   waku/node/peer_manager,
   waku/waku_relay/[protocol, topic_health],
@@ -155,6 +156,8 @@ proc watchdogThreadBody(ctx: ptr WakuContext) {.thread.} =
 proc wakuThreadBody(ctx: ptr WakuContext) {.thread.} =
   ## Waku thread that attends library user requests (stop, connect_to, etc.)
 
+  logging.setupLog(logging.LogLevel.DEBUG, logging.LogFormat.TEXT)
+
   let wakuRun = proc(ctx: ptr WakuContext) {.async.} =
     var waku: Waku
     while true: