refactor!: use new iroh-metrics version, no more global tracking (#58)

## Description

Adapts iroh-metrics for n0-computer/iroh-metrics#15 and n0-computer/iroh#3262

Depends on n0-computer/iroh#3262

## Breaking Changes


* `metrics::Metrics` now implements `MetricsGroup` from the  ì[email protected]`
* Metrics are no longer tracked into the `static_core` from `iroh-metrics`, but instead are tracked per `Gossip` and exposed via `Gossip::metrics`
* `proto::state::State::handle` now takes `Option<&Metrics>` as new 4th parameter

## Notes & open questions

<!-- Any notes, remarks or open questions you have to make about the PR. -->

## Change checklist

- [x] Self-review.
- [x] Documentation updates following the [style guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text), if relevant.
- [x] Tests if relevant.
- [x] All breaking changes documented.

Author: Frando

.cargo/config.toml

@@ -0,0 +1,3 @@
+[target.wasm32-unknown-unknown]
+runner = "wasm-bindgen-test-runner"
+rustflags = ['--cfg', 'getrandom_backend="wasm_js"']

.github/workflows/ci.yaml

@@ -150,6 +150,8 @@ jobs:
   wasm_build:
       name: Build wasm32
       runs-on: ubuntu-latest
+      env:
+          RUSTFLAGS: '--cfg getrandom_backend="wasm_js"'
       steps:
         - name: Checkout sources
           uses: actions/checkout@v4