nixos/alsa: rebirth from the ashes

The ALSA module was essentially removed in 3eeff547, with the main
motivation of avoiding confusion as to what `sound.enable` really meant.

As that could be achieved with a simple rename, this change brings back
the module in full force under the `hardware.alsa` namespace (with clear
beware signs for the pulse and pipewire folks) and adds a lot of useful
extra features. These include

 - `defaultDevice` to set the default playback and capture devices

 - `cardAliases`,`deviceAliases` to assign meaningful names to sound cards
   and devices (instead of say, `hw:0,1`)

 - `controls` to create virtual volume controls

 - `enableRecorder` to easily configure a loopback device to record
   the computer audio

 - fixes to the udev restore rules

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