feat(iroh-gossip): configure the max message size #8462

Job	Run time
Checking fmt	6s
Checking docs	1m 12s
cargo deny	31s
check_semver	4m 45s
clippy_check	2m 40s
Cross Build Only (armv7-linux-androideabi)	1m 1s
Cross Test (i686-unknown-linux-gnu)	4m 12s
Minimal Supported Rust Version	1m 55s
Cross Build Only (aarch64-linux-android)	59s
Cross Build Only (x86_64-unknown-freebsd)	1m 6s
Run network simulations/benchmarks	7m 16s
Cross Build Only (x86_64-unknown-netbsd)	1m 7s
Build wasm32	39s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 41s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 32s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	3m 50s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 18s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	3m 50s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	4m 1s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	3m 12s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	3m 1s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 54s
	55m 48s

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