jj-sparse: add page (#23994)

pages/common/jj-sparse.md

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+# jj sparse
+
+> Manage which paths from the working-copy commit are present in the working copy.
+> More information: <https://docs.jj-vcs.dev/latest/cli-reference/#jj-sparse>.
+
+- List the patterns currently present in the working copy:
+
+`jj sparse list`
+
+- Start an editor to update the sparse patterns:
+
+`jj sparse edit`
+
+- Reset the patterns to include all files in the working copy:
+
+`jj sparse reset`
+
+- Exclude all files from the working copy:
+
+`jj sparse set --clear`
+
+- Update patterns to only include specified paths:
+
+`jj sparse set --clear --add {{path/to/directory}}`
+
+- Add a path to the working copy:
+
+`jj sparse set --add {{path/to/directory}}`
+
+- Add multiple paths to the working copy:
+
+`jj sparse set --add {{path/to/directory1}} --add {{path/to/directory2}}`
+
+- Remove a path from the working copy:
+
+`jj sparse set --remove {{path/to/directory}}`