[PM-15054] Add API for importing ciphers

[SaintPatrck]

🎟️ Tracking

PM-15054

📔 Objective

Add an API for importing ciphers, including folders and folder relationships.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed
  issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 0aaf7979-9f8f-4f4d-bda9-ca291ac9384e

New Issues

Severity	Issue	Source File / Package	Checkmarx Insight
	Privacy_Violation	/app/src/main/java/com/x8bit/bitwarden/ui/vault/feature/item/VaultItemViewModel.kt: 875	Attack Vector

Fixed Issues

Severity	Issue	Source File / Package
	Unpinned Actions Full Length Commit SHA	/crowdin-pull.yml: 26