[model-parameters] Improve the "parameter type" input

[dlqqq]

Description

Follow-up to #1456.

The "parameter type" input makes more sense as a Select (dropdown) component that does not allow the user to type. There are only a fixed number of types, so we shouldn't allow freeform input here.

It would also be nice if:

1. Parameter type is disabled (i.e. uneditable) when a static parameter was selected.

2. Selecting a parameter type automatically focuses the "Argument value" input.

[dlqqq]

As @andrii-i called out, we should also add validation on the parameter value based on the type. Right now we only do it for booleans.