Install switch: make create-switch

Run Dune in watch mode: dune build -w @all, notice how the build leverages all cores in cpu.

Modify chunk2/dir_2_1/m2_1_1_1.ml and mli, notice how the build finishes very fast, even if a few modules depend on it.

Modify chunk1/dir_1_1/m1_1_1_1.ml and mli, notice how the build only executes 1 job at a time.