[PM-10405] Add bitwarden-ssh crate with keygeneration support (#35)

## 🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-10405

## 📔 Objective

Adds a new bitwarden-ssh crate to the sdk. This should later include
both import-parsing and key generation.
This PR also exposes this for the web clients (not mobile yet).

## ⏰ 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

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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
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- ⛏ (`:pick:`) for minor or nitpick changes