Add effects to toolbar

### Problem to be solved

At the moment, destructive effects can be a bit awkward to use, especially the one-click ones (fade in/out, invert, reverse, repair; also the spectral edit ones). This is especially true when making multiple edits of this.

### Your idea

Given we now have a configurable toolbar, we should add relevant effects (perhaps: all effects?) to be optionally enabled in the toolbar.

### Prior art

POC: https://github.com/audacity/audacity/pull/11186, https://github.com/audacity/audacity/pull/11201 specifically for fade in/out

### Additional context

* https://github.com/audacity/audacity/issues/11233

Start by reviewing the proof-of-concept pull requests 11186 and 11201, then read the related issue 11233 for scope and constraints. Identify how the configurable toolbar currently exposes actions; done means the intended effects can be optionally enabled there without making repeated destructive edits awkward.

Written by the indexing model from the issue text.