Merge #21560: net: Add Tor v3 hardcoded seeds

b2ee8b207de78f03356905bd60b7b00b6f49c252 net: Deserialize hardcoded seeds from BIP155 blob (W. J. van der Laan)
9b29d5df7fc555eaea42029f334f2995c6ccde3d contrib: Add explicit port numbers for testnet seeds (W. J. van der Laan)
2a257de113fd31539b68c28c47ef94f257b6e427 contrib: Add a few TorV3 seed nodes (W. J. van der Laan)
06030f7a42dea33c5120504dcd99d1714883f271 contrib: generate-seeds.py generates output in BIP155 format (W. J. van der Laan)

Pull request description:

  Closes #20239 and mitigates my node's problem in #21351.

  - Add a few hardcoded seeds for TorV3
    - As the [bitcoin-seeder](https://github.com/sipa/bitcoin-seeder) doesn't collect TorV3 addresses yet, I have extracted these from my own node using [a script](https://gist.github.com/laanwj/b3d7b01ef61ce07c2eff0a72a6b90183) and added them manually. This is intended to be a temporary stop gap until 22.0's seeds update.

  - Change hardcoded seeds to variable length BIP155 binary format.
    - It is stored as a single serialized blob in a byte array, instead of pseudo-IPv6 address slots. This is more flexible and, assuming most of the list is IPv4, more compact.
    - Only the (networkID, addr, port) subset (CService). Services and time are construed on the fly as before.

  - Change input format for `nodes_*.txt`.
    - Drop legacy `0xAABBCCDD` format for IPv4. It is never generated by `makeseeds.py`.
    - Stop interpreting lack of port as default port, interpret it as 'no port', to accomodate I2P and other port-less protocols (not handled in this PR). An explicit port is always generated by `makeseeds.py` so in practice this makes no difference right now.

  A follow-up to this PR could do the same for I2P.

ACKs for top commit:
  jonatack:
    ACK b2ee8b207de78f03356905bd60b7b00b6f49c252

Tree-SHA512: 11a6b54f9fb0192560f2bd7b218f798f86c1abe01d1bf37f734cb88b91848124beb2de801ca4e6f856e9946aea5dc3ee16b0dbb9863799e42eec1b239d40d59d

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