Allow copilot-cli to write via tool to only specific files

[avinashpancham]

Describe the feature or problem you'd like to solve

When the copilot write tool option is allowed it gives access to all files

Proposed solution

Allow to restrict the scope the model is allowed to write to, for example with directories or files

copilot --allow-tool 'write(foo.txt)' --allow-tool 'write(bar/)'

This is similar to the shell tool option that is already supported https://docs.github.com/en/copilot/concepts/agents/about-copilot-cli#using-the-approval-options

copilot --deny-tool 'shell(git push)'

Example prompts or workflows

copilot --allow-tool 'write(foo.txt)' --allow-tool 'write(bar/)'

Additional context

No response