status: Show list of loaded language modules

When querying the '/status' node in the control API, display the list of
currently loaded modules.

So we now get something like

  {
      "modules": {
          "python": [
              {
                  "version": "3.12.3",
                   "lib": "/opt/unit/modules/python.unit.so"
              },
              {
                  "version": "3.12.1",
                  "lib": "/opt/unit/modules/python-3.12.1.unit.so"
              }
          ],

          "wasm": {
              "version": "0.1",
              "lib": "/opt/unit/modules/wasm.unit.so"
          },

          "wasm-wasi-component": {
              "version": "0.1",
              "lib": "/opt/unit/modules/wasm_wasi_component.unit.so"
          }
      },

      ...
  }

This can be useful for debugging to show exactly what modules Unit has
loaded _and_ from where.

Closes: https://github.com/nginx/unit/issues/1343
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

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