* 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
* fix: repeated fields are packed in proto3
* fix: add new field for shards in metadata protobuffers to avoid breaking change and deprecate original field
This reverts commit dc1d6ce4bf7390e23b73d96634ff87ca9341e129.
We need to revert this commit because
the waku-simulator stopped working. i.e. the nodes couldn't establish
connections among them: 054ba9e33f
Also, the following js-waku test fails due to this commit:
"same cluster, different shard: nodes connect"
* waku_lightpush/protocol.nim: minor changes to make it compile after revert
