feat!: add private key to libp2p components

[wemeetagain]

Description

• Add privateKey to Components and use it where possible
• Update pubsub, identify, circuit-relay v2, record envelope sealing to use privateKey instead of peerId

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

BREAKING CHANGE:

• IdentifyComponents now includes a privateKey
• PubSubComponents now includes a privateKey
• CircuitRelayServerComponents now includes a privateKey
• RecordEnvelope.seal now has a privateKey as the second param rather than a peerId
• RecordEnvelope constructor now takes a publicKey

[achingbrain]

Is there a way we can do this in stages to prevent it causing libp2p v2? Perhaps just adding the private key in the first instance, then releasing it, then upgrading noise etc to use it?

[dhuseby]

Blocked waiting for the next breaking release