Implement `from_seed_unchecked` for `Ed25519KeyPair` #1296

Job	Run time
bindgen-dependency (ubuntu-latest)	30s
apidiff (aws-lc-sys, branch)	2m 50s
bindgen-dependency (macos-13)	39s
clippy (aws-lc-rs, --features bindgen,unstable)	1m 15s
apidiff (aws-lc-sys, published)	2m 56s
bindgen-dependency (macos-14-xlarge)	30s
bindgen-fips-dependency (ubuntu-latest)	31s
clippy (aws-lc-rs, --features bindgen,unstable,fips)	1m 45s
apidiff (aws-lc-fips-sys, branch)	3m 13s
bindgen-dependency (windows-latest)	52s
clippy (aws-lc-rs, --no-default-features --features aws-lc-sys)	56s
bindgen-fips-dependency (macos-13)	42s
apidiff (aws-lc-fips-sys, published)	3m 54s
apidiff (aws-lc-rs, branch)	2m 54s
bindgen-fips-dependency (macos-14-xlarge)	30s
dependency-review	20s
apidiff (aws-lc-rs, published)	3m 9s
bindgen-fips-dependency (windows-latest)	1m 0s
metadata-checks	36s
rustfmt	31s
Resolve the dependencies to the minimum SemVer version (aws-lc-rs)	57s
semver-checks	6m 55s
Resolve the dependencies to the minimum SemVer version (aws-lc-sys)	47s
udeps	7m 59s
Resolve the dependencies to the minimum SemVer version (aws-lc-fips-sys)	1m 8s
	47m 19s

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