[FEATURE] Support for other plugin sample rates

[sdatkinson]

Is your feature request related to a problem? Please describe.
The plugin is made to run at 48kHz. If you don't, it won't sound right.

Describe the solution you'd like
Keep the plugin sounding the same at different sample rates. A resampling block would do the trick.

Describe alternatives you've considered
Getting along with 48k.

Additional context
This doesn't seem to be a big deal to most users so far.

[sdatkinson]

This Issue is for running the plugin at different sample rates. Models that were trained on data at different sample rates is out of scope.

[sdatkinson]

Now that sdatkinson/neural-amp-modeler#284 is in, we're clear to get this implemented 🎉