[PM-11924] Add ssh-key item type

[quexten]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-11924

Server PR: https://bitwarden.atlassian.net/browse/PM-10394

📔 Objective

Add a new item type for ssh-keys.

⏰ 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

[github-actions]

Checkmarx One – Scan Summary & Details – 46b3d8a2-1941-448e-ac58-b74d562d9e17

No New Or Fixed Issues Found

[codecov]

Codecov Report

Attention: Patch coverage is 85.54913% with 25 lines in your changes missing coverage. Please review.

Project coverage is 58.77%. Comparing base (8dde05e) to head (9ee77f3).

Files with missing lines	Patch %	Lines
crates/bitwarden-vault/src/cipher/ssh_key.rs	0.00%	15 Missing ⚠️
crates/bitwarden-exporters/src/models.rs	14.28%	6 Missing ⚠️
crates/bitwarden-vault/src/cipher/cipher.rs	94.64%	3 Missing ⚠️
crates/bitwarden-exporters/src/lib.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1037      +/-   ##
==========================================
+ Coverage   58.44%   58.77%   +0.32%     
==========================================
  Files         192      193       +1     
  Lines       13528    13696     +168     
==========================================
+ Hits         7907     8050     +143     
- Misses       5621     5646      +25     

☔ View full report in Codecov by Sentry.
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[Hinton]

Generally looks good, some minor things to tweak and add some tests.

[quexten]

Seems the linting and ruby build failures are unrelated and also happening on other PRs.