Release v0.21.0 - Fix, Clean & Polish · n0-computer/iroh

⚠️ Breaking Changes

iroh-relay
- Clients will dial /relay instead of /derp, this means all 0.21 nodes are only compatible with relays >= 0.20

iroh-cli
- top level commands
  - author -> authors
  - blob -> blobs
  - doc -> docs
  - tag -> tags
  - sub commands
    - new -> create
- added metrics_dump_path on the top level CLI parameters, which if set will make sure metrics are collected at regular intervals and written to the provided path in CSV format.
iroh
- removed deprecated
  - client::MemIroh use iroh::client::Iroh instead
  - client::QuicIroh use iroh::client::Iroh instead
  - client::MemDocuse iroh::client::docs::Doc instead
  - client::QuicDoc use iroh::client::docs::Doc instead
iroh-net
- renamed
  - field: magicsock::metrics::Metrics::update_endpoints -> update_direct_addrs.
- relay server is now behind the iroh-relay feature flag
- removed
  - endpoint::Builder::peers_path
- added
  - endpoint::Builder::known_nodes
no automatic storage of known peers anymore in iroh-net
Public interfaces using tokio_util::task::LocalPoolHandle now use our own LocalPool/LocalPoolHandle.

(ci) Publish docker images (#2520) - (c0fa1f4)
(iroh-cli) [breaking] Realign cli commands with library (#2522) - (4c11c58)
(iroh-net) Add holepunching events (#2495) - (8685222)
(iroh-net) [breaking] Remove fs based peers storage (#2510) - (0a8cb8a)
(iroh-net) Update netdev to 0.30 (#2528) - (214bb0c)
(iroh-relay) Add more context to iroh-relay errors (#2506) - (04df203)

(iroh-blobs) Properly handle Drop in local pool during shutdown (#2517) - (b4506b2)
(iroh-docs) Do not dial invalid peers (#2470) - (7579caa)
(iroh-metrics) Add the bind addr in errors for bind failures (#2511) - (50a8b5c)

(iroh) Make use of quic-rpc-derive macros to prettify the rpc declarations (#2508) - (026baaa)
(iroh-net) [breaking] Move relay implemention in iroh-net behind iroh-relay cfg flag (#2516) - (f37d9f9)
(iroh-net) Switch to new iroh-relay route /relay instead of /derp (#2489) - (b7b493d)
(iroh-net) More renaming of endpoint to direct address (#2515) - (0c03f6e)
(iroh-net) Remove random choice of direct addr (#2509) - (c1c3539)
[breaking] Metrics (#2464) - (09e9746)

(bytes) Bytes v1.6.0 was yanked so upgrade to bytes v1.6.1 (#2503) - (ecfbed3)
Add a flaky tests failure report to our discord notification (#2496) - (f84c06e)
Keep GitHub Actions up to date with GitHub's Dependabot (#2498) - (538efbf)