feat(gossipsub): Remove peer_topics and topic_peers #715

Job	Run time
Check rustdoc intra-doc links	19s
clippy (nightly-2023-09-10)	17s
Compile on wasm32-unknown-unknown	13s
Compile on wasm32-unknown-emscripten	7s
examples	13s
Compile on wasm32-wasi	23s
Compile with select features (mdns tcp dns tokio)	12s
Compile on x86_64-apple-darwin	8s
Compile with select features (mdns tcp dns async-std)	11s
Compile on x86_64-pc-windows-msvc	12s
IPFS Integration tests	10s
Compile with MSRV	4s
Run all WASM tests	1m 5s
cargo-deny	16s
Check for changes in proto files	13s
Ensure that `Cargo.lock` is up-to-date	5s
gather_published_crates	13s
manifest_lint	13s
rustfmt	12s
semver	14s
	5m 0s

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