[Traits] Support traits in swift package edit and swift package unedit commands

[bripeticca]

WIP

Fixes #8354

Motivation:

Since the edit and unedit commands can affect dependency resolution, we must support the ability to specify trait configurations.

Modifications:

• Add entrypoint for trait options in the edit/unedit commands

Result:

TODO:

• Determine how calls to resolve affect packages in edit mode
  • If a dependency is guarded by traits in the current workspace, can we run an edit command on it?
  • If we edit a dependency and modify its trait configurations for its dependencies, how does the resulting resolution change?
• Add test coverage for edit/unedit cases with trait configurations
• Add test coverage for edit/unedit cases with nested deps that are guarded by traits + how that changes with edit/unedit