add grep tool use formatter

[LasmarKhalifa]

closes #923

Improves the formatting of the grep tool use message.

Current output:

New output:

[LasmarKhalifa]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• add taskoutput tool use formatter #945
• add taskcreate tool use formatter #944
• add taskupdate tool use formatter #943
• add agent tool use formatter #942
• add task tool use formatter #941
• add skill tool use formatter #940
• add todowrite tool use formatter #939
• add edit tool use formatter #938
• add write tool use formatter #937
• add grep tool use formatter #936 👈 (View in Graphite)
• add glob tool use formatter #935
• add read tool use formatter #934
• add bash tool use formatter #933
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.