[PM-15093] Add encstring type 7 (Cose/XChaChaPoly1305]

[quexten]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-15093

📔 Objective

This adds server-side support for the new encstring type.

📸 Screenshots

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) 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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Checkmarx One – Scan Summary & Details – a3a4eb7b-b085-4703-ac07-816dac2c4689

New Issues (1)

Checkmarx found the following issues in this Pull Request

Severity	Issue	Source File / Package	Checkmarx Insight
	CSRF	/src/Api/KeyManagement/Controllers/AccountsKeyManagementController.cs: 93	details Method RotateUserAccountKeysAsync at line 93 of /src/Api/KeyManagement/Controllers/AccountsKeyManagementController.cs gets a parameter from a user ... Attack Vector

Fixed Issues (2)

Great job! The following issues were fixed in this Pull Request

Severity	Issue	Source File / Package
	Log_Forging	/src/Api/Controllers/DevicesController.cs: 97
	Log_Forging	/src/Api/Controllers/DevicesController.cs: 97

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.84%. Comparing base (a3734f6) to head (da83ec5).

Additional details and impacted files

@@                    Coverage Diff                     @@
##           km/userkey-rotation-v2    #5470      +/-   ##
==========================================================
- Coverage                   47.78%   44.84%   -2.94%     
==========================================================
  Files                        1538     1538              
  Lines                       71264    71265       +1     
  Branches                     6396     6396              
==========================================================
- Hits                        34050    31961    -2089     
- Misses                      35792    37932    +2140     
+ Partials                     1422     1372      -50     

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