Refactor Step 1 - move "padded" cipher implementation to sub-module #449

Job	Run time
apidiff (aws-lc-sys, branch)	2m 25s
apidiff (aws-lc-sys, published)	2m 44s
apidiff (aws-lc-fips-sys, branch)	3m 52s
bindgen-dependency (ubuntu-latest)	27s
bindgen-fips-dependency (ubuntu-latest)	23s
apidiff (aws-lc-fips-sys, published)	2m 49s
bindgen-dependency (macos-12)	45s
bindgen-fips-dependency (macos-12)	43s
apidiff (aws-lc-rs, branch)	2m 25s
bindgen-dependency (macos-13-xlarge)	32s
bindgen-fips-dependency (macos-13-xlarge)	33s
apidiff (aws-lc-rs, published)	2m 35s
bindgen-dependency (windows-latest)	1m 8s
bindgen-fips-dependency (windows-latest)	58s
clippy (aws-lc-rs, --features bindgen,unstable)	1m 37s
copyright	3s
dependency-review	17s
clippy (aws-lc-rs, --features bindgen,unstable,fips)	1m 22s
Resolve the dependencies to the minimum SemVer version	39s
mirai-analysis	3m 22s
clippy (aws-lc-rs, --no-default-features --features aws-lc-sys)	48s
rustfmt	27s
semver-checks	1m 19s
udeps	7m 22s
	39m 35s

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