refactor: Change PBKDF2SHA512 from class to Object

[hamada147]

Overview

Change PBKDF2SHA512 from class to Object

Fixes [6309]

Checklist

My PR contains...

• No code changes (changes to documentation, CI, metadata, etc.)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes
• are not breaking changes
• If yes to above: I have updated the documentation accordingly

Documentation

• My changes do not require a change to the project documentation
• My changes require a change to the project documentation
• If yes to above: I have updated the documentation accordingly

Tests

• My changes can not or do not need to be tested
• My changes can and should be tested by unit and/or integration tests
• If yes to above: I have added tests to cover my changes
• If yes to above: I have taken care to cover edge cases in my tests

[atala-dev]

Code Coverage

File	Coverage [100.00%]	✅
apollo/src/androidMain/kotlin/io/iohk/atala/prism/apollo/hashing/PBKDF2SHA512.kt	100.00%	✅
apollo/src/appleMain/kotlin/io/iohk/atala/prism/apollo/hashing/PBKDF2SHA512.kt	100.00%	✅
apollo/src/commonMain/kotlin/io/iohk/atala/prism/apollo/hashing/PBKDF2SHA512.kt	100.00%	✅
apollo/src/jsMain/kotlin/io/iohk/atala/prism/apollo/hashing/PBKDF2SHA512.kt	100.00%	✅
apollo/src/jvmMain/kotlin/io/iohk/atala/prism/apollo/hashing/PBKDF2SHA512.kt	100.00%	✅

Total Project Coverage	91.69%	✅

[atala-dev]

🎉 This PR is included in version 1.2.11 🎉

The release is available on:

• v1.2.11
• GitHub release

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