Add a configuration option to enable package management (#12025) #296

Job	Run time
Build microbenchmarks	2m 33s
Create local opam switch (ubuntu-latest, 5)	5m 13s
Format	1m 32s
Create local opam switch (macos-latest, 4.14)	7m 36s
Documentation	1m 1s
Create local opam switch (ubuntu-latest, 4.14)	5m 25s
Nix (macos-latest)	3m 12s
Nix (ubuntu-latest)	1m 24s
Coq 8.16.1	12m 57s
Build (5.3.x, ubuntu-latest)	27m 44s
Build (ocaml-variants.5.4.0+trunk, ubuntu-latest, true)	2m 16s
Build (5.3.x, macos-13, true)	3m 25s
Build (ocaml-base-compiler.5.3.0,system-mingw, windows-latest)	9m 21s
Wasm_of_ocaml	25m 46s
Build (4.14.x, ubuntu-latest, true)	1m 15s
Build (5.3.x, macos-latest)	18m 8s
Build (4.14.x, macos-latest, true)	2m 8s
Build (ocaml-compiler.5.3.0,system-msvc, windows-latest)	15m 15s
Build (ocaml-variants.4.14.2+options,ocaml-option-32bit, ubuntu-latest, true, true)	4m 45s
Create local opam switch (macos-latest, 5)	6m 6s
Build (4.08.x, ubuntu-latest, true)	1m 14s
	2h 38m 16s

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