Remove more specialized contexts #1510

Job	Run time
nightly	1m 39s
recursive	36s
clippy	50s
docs	19s
rustfmt	14s
no_default_features	13s
features (storage)	16s
features (descriptive)	23s
features (wire)	17s
features (json)	25s
features (value)	18s
features (serde)	24s
loom	2m 5s
test (--all-targets)	1m 46s
tests_clippy	1m 37s
msrv	21s
test (--doc)	1m 32s
no_std (windows-latest, json)	1m 8s
test (-p musli-core -p musli --doc --no-default-features)	1m 5s
no_std (windows-latest, serde)	50s
no_std (ubuntu-latest, json)	19s
no_std (ubuntu-latest, serde)	16s
miri	8m 1s
fuzz	5m 42s
	30m 36s

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