feat(iroh-gossip): configure the max message size #8508

Job	Run time
Checking docs	1m 38s
cargo deny	32s
Checking fmt	12s
check_semver	2m 55s
clippy_check	2m 22s
Cross Build Only (armv7-linux-androideabi)	1m 2s
Cross Test (i686-unknown-linux-gnu)	2m 47s
Cross Build Only (aarch64-linux-android)	1m 0s
Cross Build Only (x86_64-unknown-freebsd)	1m 5s
Minimal Supported Rust Version	1m 53s
Run network simulations/benchmarks	7m 1s
Cross Build Only (x86_64-unknown-netbsd)	1m 8s
Build wasm32	28s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	3m 48s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 42s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	3m 52s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	3m 53s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 19s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 19s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	3m 25s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 59s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	3m 13s
	52m 33s

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