Swap to using serenity's data field #982

Job	Run time
Build docs	1m 18s
Clippy	52s
Rustfmt	9s
Test (MSRV)	1m 25s
Test (stable)	1m 19s
Test (beta)	1m 24s
Test (nightly)	1m 27s
Test (macOS)	8m 21s
Test (Windows)	3m 49s
Test (no features)	1m 7s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 25s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 19s
	23m 55s

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