feat: Publish self-announces as pkarr signed packets through the derper #7291

Job	Run time
clippy_check	2m 2s
Checking fmt and docs	1m 31s
Cross compile (i686-unknown-linux-gnu)	2m 20s
cargo deny	31s
Cross compile (armv7-linux-androideabi)	54s
Minimal Supported Rust Version	1m 39s
Cross compile (aarch64-linux-android)	53s
Run network simulations/benchmarks	8m 37s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 37s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 6s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 59s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	4m 5s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	3m 12s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	3m 34s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	3m 43s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	3m 11s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	3m 18s
	46m 12s

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