JWSETKit 0.22.0

• !fix: Make algorithm value optional in header
• tests: Migrating to Swift Testings
• fix: Update PBKDF2 default iterations to OWASP latest recommendation
• fix: Remove SWCompression and use zlib instead
• fix: Linux build issues of FoundationEssentials
• chore: Remove NSNumber dependency
• chore: Update PBKDF2 linux's implementation to Crypto
• chore: Use direct RSA initializer from primes
• chore: Update dependencies, minor changes
• chore: Error instead of fatalError when building on unavailable platform