docs: rewrite README around why wide events exist #11

Job	Run time
Documentation	23s
Format	21s
Clippy	32s
Test (nightly, )	34s
Test (stable, )	34s
Test (stable, --all-features)	37s
Test (nightly, --features opentelemetry)	43s
Test (nightly, --all-features)	36s
Test (nightly, --features tokio)	32s
Test (stable, --features opentelemetry)	33s
Test (stable, --features tokio)	32s
	5m 57s

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