feat: add traceFunction call to metrics

[achingbrain]

Allow tracing method calls using a metrics implementation.

const libp2p = await createLibp2p()

for await (const foo of libp2p.contentRouting.findProviders(cid, {
  context: libp2p.metrics?.createTraceContext(),
  signal: AbortSignal.timeout(20_000)
}) {
  //...
}

Adds tracing support to libp2p.contentRouting.* and libp2p.peerRouting.* to start with, other methods can have it added when necessary.

Traces can have attributes set on them to give context to a call (input args, output values, yielded results, etc).

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works