Investigate replacing our use of vite's `import.meta.glob` with import maps.

[chrisdevereux]

@janbaykara suggests:

Occurred to me that there could be scope for including a django variant of Ruby-style import maps, for loading Stimulus controller files for templates, as an alternative to bundling them altogether.

We in fact kind of already have this behaviour by using dynamic import() via vite's import.meta.glob to load and register controllers on-demand.

Using import maps could prove to be a more 'standard' way of providing this behaviour. Especially when the django hotwired libraries mature a bit.