feat(iroh-gossip): configure the max message size #8489

Job	Run time
Checking docs	59s
Checking fmt	12s
cargo deny	29s
check_semver	4m 51s
clippy_check	1m 32s
Cross Build Only (armv7-linux-androideabi)	45s
Cross Test (i686-unknown-linux-gnu)	58s
Cross Build Only (aarch64-linux-android)	43s
Cross Build Only (x86_64-unknown-freebsd)	41s
Minimal Supported Rust Version	56s
Run network simulations/benchmarks	31s
Cross Build Only (x86_64-unknown-netbsd)	43s
Build wasm32	45s
CI Test Suite / Tests (ubuntu-latest, stable, all)	20s
CI Test Suite / Tests (ubuntu-latest, stable, none)	23s
CI Test Suite / Tests (ubuntu-latest, stable, default)	23s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	32s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 45s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	28s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 44s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	31s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 49s
	22m 0s

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