chore: rename Ciphersuite -> CipherSuite [WPB-25044]

[coriolinus]

What's new in this PR

---

PR Submission Checklist for internal contributors

• The PR Title
  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[SimonThormeyer]

Not sure if CryptoCiphersuite and MlsCiphersuite are both openmls types, if they're not, we should also rename those.