feat: mutable access for all fields in BundleBuilder #3656

Job	Run time
test stable --no-default-features	54s
test stable	54s
test no_std	24s
test stable --all-features	1m 32s
test beta --no-default-features	56s
check no-default-features	31s
test beta	1m 0s
test beta --all-features	1m 23s
test nightly --no-default-features	47s
check serde	20s
test nightly	53s
test nightly --all-features	1m 20s
check std	16s
clippy	1m 23s
docs	1m 16s
fmt	12s
	14m 1s

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