docs: API docs enhancements

[wemeetagain]

### Tasks
- [ ] https://github.com/libp2p/js-libp2p/issues/1860
- [ ] https://github.com/libp2p/js-libp2p/issues/1913
- [ ] https://github.com/libp2p/js-libp2p/pull/2097
- [ ] https://github.com/libp2p/js-libp2p/issues/2096
- [ ] https://github.com/libp2p/js-libp2p/issues/2101
- [ ] https://github.com/libp2p/js-libp2p/issues/2103
- [ ] https://github.com/libp2p/js-libp2p/issues/2083
- [ ] https://github.com/libp2p/js-libp2p/issues/2077
- [ ] https://github.com/libp2p/js-libp2p/issues/2099
- [ ] https://github.com/libp2p/js-libp2p/issues/2078
- [ ] https://github.com/libp2p/js-libp2p/issues/2112
- [ ] https://github.com/libp2p/js-libp2p/issues/2091
- [ ] https://github.com/libp2p/js-libp2p/issues/2113
- [ ] https://github.com/libp2p/js-libp2p/issues/1777
- [ ] https://github.com/libp2p/js-libp2p/issues/2117

[wemeetagain]

• Ensure that interface methods are defined as methods rather than properties
  • [x] Update linter config - https://github.com/ipfs/eslint-config-ipfs/pull/190
  • [x] Update Aegir's linter config - https://github.com/ipfs/aegir/pull/1374
  • [x] Update Aegir in this repo and fix linter errors

[maschad]

@wemeetagain I have moved the other issue to https://github.com/libp2p/js-libp2p/issues/2096 and we can use this issue to track other API Doc enhancements