Implements the idea from #1060 - allows us to get some insight into what's happening in a libp2p node out side of just bandwidth stats.
Configures a few default metrics if metrics are enabled - current connections, the state of the dial queue, etc.
Also makes the `Metrics` class not depend on the `ConnectionManager` class, otherwise we can't collect simple metrics from the connection manager class due to the circular dependency.
Looks like this project stopped running the `test:node` npm script when it was migrated to gh actions.
Re-enable it and fix all the related test failures.
Uses npm to install deps for examples.
We can put yarn back when we remove `node-fetch@2.x` from ipfs-utils, or when
yarn can download tarball dependencies reliably.
This either needs:
1. https://github.com/node-fetch/node-fetch/pull/1172 merging
2. Swap node-fetch for undici
3. Drop CJS support (node-fetch 3 has the above fix but is ESM-only)
BREAKING CHANGES:
top level types were updated, multiaddr@9.0.0 is used, dialer and keychain internal property names changed and connectionManager minPeers is not supported anymore
