[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 – cbe63d41-a2c4-4902-8377-9f7ec59a7ba9

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 58.60%. Comparing base (be75311) to head (b835c2f).
Report is 1 commits behind head on main.

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   58.27%   58.60%   +0.32%     
==========================================
  Files         197      198       +1     
  Lines       13614    13782     +168     
==========================================
+ Hits         7934     8077     +143     
- Misses       5680     5705      +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.

[Hinton]

Merged in the latest main which should fix most of the workflows.

[Hinton]

Some improvements to the comments to resolve some ambiguity

[Hinton]

There are multiple ways to encode public keys, are we using the OpenSSH format or RFC 4716? 4716 includes headers and are multi line, while OpenSSH is just the B64 in a single line.

[quexten]

We use the single line openssh format. This is what 1Password does too, and what servers and GitHub accept as public keys pasted as authentication keys.