Implement Kopia CLI common args and flags

[plar]

Change Overview

This PR is the second in the series of PRs that will add a new way to build Kopia CLI commands.

Previous PRs:

1. PR-2649

This PR introduces common argument structures and flags for Kopia CLI, along with extended error definitions:

• pkg/kopia/cli/CommonArgs and pkg/kopia/cli/CacheArgs structs encapsulate common command-line arguments and cache-related arguments for the Kopia CLI.
• pkg/kopia/cli/internal/flag/common package presents common and cache-related flags for the Kopia CLI.
• pkg/kopia/cli/errors.go is expanded with specific errors for common and cache arguments. (ErrInvalidCommonArgs, ErrInvalidCacheArgs, and ErrInvalidID).

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Test Plan

• 💪 Manual
• ⚡ Unit test
• 💚 E2E