Add move_path tool (#27366)

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Release Notes:

- N/A

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Co-authored-by: Marshall Bowers <git@maxdeviant.com>

crates/assistant_tools/src/move_path_tool/description.md

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+Moves or rename a file or directory in the project, and returns confirmation that the move succeeded.
+If the source and destination directories are the same, but the filename is different, this performs
+a rename. Otherwise, it performs a move.
+
+This tool should be used when it's desirable to move or rename a file or directory without changing its contents at all.