[PM-21691] - Added tree and test with implementation for CollectionView

[jrmccannon]

🎟️ Tracking

PM-21691

📔 Objective

This splits the collections code out of the vault crate and adds a Tree implementation for representing the parent child relationship between nested collections.

⏰ 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 – fb485000-302e-49d8-b1c0-1f00c8fc9b2a

Great job, no security vulnerabilities found in this Pull Request

[codecov]

Codecov Report

Attention: Patch coverage is 71.07143% with 81 lines in your changes missing coverage. Please review.

Project coverage is 71.87%. Comparing base (f2bc708) to head (1d08bf9).

Files with missing lines	Patch %	Lines
crates/bitwarden-vault/src/collection_client.rs	0.00%	36 Missing ⚠️
crates/bitwarden-uniffi/src/vault/collections.rs	0.00%	20 Missing ⚠️
crates/bitwarden-collections/src/collection.rs	20.00%	12 Missing ⚠️
crates/bitwarden-collections/src/tree.rs	95.02%	10 Missing ⚠️
crates/bitwarden-collections/src/error.rs	0.00%	1 Missing ⚠️
crates/bitwarden-collections/src/lib.rs	0.00%	1 Missing ⚠️
crates/bitwarden-collections/src/uniffi_support.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #279      +/-   ##
==========================================
- Coverage   71.89%   71.87%   -0.03%     
==========================================
  Files         240      244       +4     
  Lines       19622    19892     +270     
==========================================
+ Hits        14108    14297     +189     
- Misses       5514     5595      +81     

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[coroiu]

Just some minor comments, but very nice overall, +1 for the tests 👍

[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