Add proxy and onion support for ckb-network

[eval-exec]

What problem does this PR solve?

This PR want to add socks5 proxy and onion support for ckb.

Add network.proxy and network.onion config:

# [network.proxy]
### The proxy_url is user-specified SOCKS5 address, like: socks5://127.0.0.1:7891
# proxy_url = "socks5://127.0.0.1:9050"

### Toggle random authentication for the proxy server.
### Default setting: true
###
### When enabled (true), CKB will generate a random username and password for each connection
### to the proxy server.
### For a Tor Server, this increases privacy by ensuring the proxy cannot correlate
### multiple connections.
### Refer to the 'IsolateSOCKSAuth' section in the following documentation:
### https://manpages.debian.org/testing/tor/torrc.5.en.html
###
### Important Note:
### If you are using a non-Tor SOCKS5 proxy that supports, but does not require authentication,
### enabling this may lead to connection rejections. In such cases, set proxy_random_auth to false.
# proxy_random_auth = true

# [network.onion]
### If CKB needs to run behind the Onion network,
### the user should start a Tor server and set proxy_url to the Tor server's address.
### then MUST set [network.proxy.proxy_url] to tor server's address.
### The default Tor SOCKS5 proxy URL is socks5://127.0.0.1:9050.
### For more information on configuring Tor, visit: https://linux.die.net/man/1/tor

### Enable or disable listening on the Onion network.
### When set to true, CKB will accept incoming connections over Tor.
### You can get the onion listening address in log, or by local_node_info RPC
# listen_on_onion = true

### The onion service will proxy incoming traffic to `p2p_listen_address`.
### If the CKB's peer-to-peer listen address is not set to the default 127.0.0.1
### with the port specified in `[network].listen_addresses` for IPv4, you should configure this field.
# p2p_listen_address = "127.0.0.1:8115"

### The address and port of the Tor SOCKS5 proxy server that CKB will use to establish
### outbound connections to other Onion services. If not set, it will use network.proxy.proxy_url
# onion_server = "127.0.0.1:9050"

### The address and port of the Tor ControlPort, which allows CKB to communicate with
### the Tor process for tasks like creating Onion services.
### Default: "127.0.0.1:9051"
# tor_controller = "127.0.0.1:9051"

### The password for authenticating with the Tor ControlPort.
### This should match the 'HashedControlPassword' set in your Tor configuration.
### Leave empty if no authentication is required.
# tor_password = ""

Start a tor server: tor --SocksPort 9050 --ControlPort 9051, finaly, start the ckb node, if network.onion.listen_on_onion is true, it will auto connect to the tor server, and use tor control port to create onion service.

Related changes

• Add ProxyConfig and OnionConfig to network config
• Support socks5 authentication like: socks5://<username>:<password>@server_host:port
• Support connect to onion ckb node, and listen on the onion hidden network
• [WIP] Integration test for ckb-onion
  • node1(onion) can succesfully connect node2(node2) in the onion network
  • noode1(onion) can succesfully connect to node2(non-onion)
  • node1(onion) connect node0(onion), node2(onion) connect to node0, expect node1 and node2 can reach each other
  • node1(non-onion) can use [network.proxy] via a normal socks5 proxy
• ckb-onion related configuration's documentation in ckb.toml

Note:
Need to setup promethues for tor process: https://gitlab.torproject.org/tpo/onion-services/onionprobe

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code ci-runs-only: [ quick_checks,linters ]

Side effects

• None

Release note

Title Only: Include only the PR title in the release note.

[eval-exec]

nervosnetwork/tentacle#392

[eval-exec]

I removed the struct NetworkAddresses because it was unnecessary. Then I rebased onto develop branch.

Invite @driftluo @quake @zhangsoledad @doitian @chenyukang review again.

[eval-exec]

In latest commit: 48013a4

I move "tor"/"onion" related instructions from [network.proxy] to [network.onion] @quake

[eval-exec]

@quake In the latest commit: 62e959b , I added onion_external_port: u16 to [network.onion] to support configuring onion service's external port.

[chenyukang]

any specific reason for ignore this error?

[eval-exec]

because reader.listen_addrs() have many addresses. In reader.listen_addrs().iter(), if we only parsed a addressed failed, there maybe others addresses are ok.

@driftluo what's your opinion?

[chenyukang]

this option will be ignored if user already set onion_server?

[eval-exec]

No, proxy_url will proxy all traffic. onion_server is used to dial onion address.