Enhance EncryptionCipher with Identifiable and CaseIterable conformance, update version to 0.1.8

[nedithgar]

Add conformance to Identifiable and CaseIterable for the EncryptionCipher struct to improve usability in UI contexts. Update the version number to reflect the new changes.

[Copilot]

Pull Request Overview

Add Identifiable and CaseIterable conformance to the EncryptionCipher struct to improve its usability in UI contexts, and update the CLI version to 0.1.8.

• Added Identifiable conformance with id property returning the cipher's wire-format name
• Added CaseIterable conformance with allCases property mirroring the existing known ciphers
• Updated version number from 0.1.7 to 0.1.8

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Sources/SwiftKeyGenCLI/main.swift	Version bump to 0.1.8
Sources/SwiftKeyGen/Formats/OpenSSH/OpenSSHPrivateKey.swift	Enhanced EncryptionCipher with protocol conformances and documentation

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