feat/refactor: support the node-level proxy chain

[mzz2017]

Background

This PR implements node-level proxy chain.

See #236

Scheme:

node {
  new_node_name: 'node link 1 (endpoint) -> node link 2 (relay)'
}

Example:

node {
  # case 1: tuic over vless (different nodes)
  chains: 'tuic://my.endpoint.com:18364/xxxxx -> vless://ohmy.relay.com:12212/xxxxx'

  # case 2: socks5 over wss (same server port, so wss is the transport layer)
  chains2: 'socks5://yeeeah.v2raya.org:6999 -> wss://yeeeah.v2raya.org:6999/7cadf625-171c-4002-7abc-257f6485fcc2'
}

Moreover, if you are a subscription maker, you can also use such expressions in your subscription content. And then encode them with base64:

tuic://my_tuic_link -> vmess://my_vmess_link
ss://my_ss_link -> vmess://my_vmess_link

Checklist

• The Pull Request has been fully tested
• There's an entry in the CHANGELOGS
• There is a user-facing docs PR against https://github.com/daeuniverse/dae

Full changelogs

• [Implement ...]

Test Result

Future Work

We need to support the group-level proxy chains:

group1 -> group2

[mzz2017]

Test Result (socks5 + wss):

[dae-prow]

🧪 Since the PR has been fully tested, please consider merging it.

[piyoki]

Link to #236

[piyoki]

Working as expected, thanks for the efforts 💪

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[mzz2017]

Test Result (from CTO):