This fixes a regression in the feature system:
The asset installation didn't get turned off by the feature.

Add error logging to the install functions.

Properly show features in setup

* fix(feat): disable `mkdir` in wasm_wm

The `wasm_vm` creates the `plugin_dir` before mounting it.
Turn that behavior off on `feature-disable-asset-installation`.

Alternative:
    Is this even needed? We make sure the directory is there upon the
    normal asset installation.

fixes zellij-org#1130

disable `mkdir` in `wasm_vm` on `feature-disable-asset-installation`