Implement linked command

[albertodebortoli]

Description

This PR implements the linked command to list the tools that are linked (and therefore available) in the current project folder.

E.g.

luca linked

FirebaseCLI:
  version: 14.12.1
  binary: firebasee
  location: /Users/alberto/.luca/tools/FirebaseCLI/14.12.1/firebasee
Sourcery:
  version: 2.2.5
  binary: sourcery
  location: /Users/alberto/.luca/tools/Sourcery/2.2.5/bin/sourcery
tuist:
  version: 4.78.0
  binary: tuist
  location: /Users/alberto/.luca/tools/tuist/4.78.0/tuist

Type of Change

• Feature
• Bug fix
• Maintenance / Refactor
• Documentation
• CI / Tooling
• Other (specify)

How Has This Been Tested?

Describe the testing strategy and commands executed.

• Added / updated unit tests
• Manually tested locally
• Tested on macOS (arch: arm64 / x86_64)
• Other

Screenshots / Demo (if applicable)

Add images, logs, or terminal output.

Checklist

• Swift code builds locally (swift build)
• Tests pass locally (swift test)
• Code style / formatting respected
• Documentation updated (README / comments)
• Version / tag alignment considered (if release related)
• PR title follows conventional style (optional)

CI Considerations

• Affects build time notably
• Requires new secrets / env vars
• Alters release process

Breaking Changes?

• No
• Yes