Remove dependency on ssi-jwk crate (#53) #340

Job	Run time
Preflight docs.rs build	1m 6s
Enforce Rust code format	13s
License / vulnerability audit (advisories)	25s
Clippy	2m 26s
License / vulnerability audit (bans licenses sources)	53s
Unit tests with default features disabled (windows-latest)	11m 24s
Unit tests with minimum versions of direct dependencies (windows-latest)	9m 43s
Unit tests (windows-latest, stable)	12m 59s
Unit tests with default features disabled (macos-latest)	3m 21s
Unit tests with minimum versions of direct dependencies (macos-latest)	2m 38s
Unit tests (windows-latest, 1.80.0)	10m 36s
Unit tests with default features disabled (ubuntu-latest)	3m 22s
Unit tests (aarch64-unknown-linux-gnu, stable)	4m 23s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	3m 1s
Unit tests (aarch64-unknown-linux-gnu, 1.80.0)	4m 12s
Unit tests (macos-latest, stable)	4m 31s
Unit tests (macos-latest, 1.80.0)	3m 10s
Check for unused dependencies	2m 13s
Unit tests (ubuntu-latest, stable)	3m 23s
Unit tests (ubuntu-latest, 1.80.0)	3m 39s
	1h 27m 38s

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