BridgeJS: Add diagnostics for unsupported `from: .global` / `from: .module(...)` parameters for imported symbols

[sliemeobn]

BridgeJS only supports the .from in top-level decls for @JSClass, @JSFunction and @JSGetter. In other places (eg: class members) the specified JSImportFrom is essentially ignored.

we should add diagnostics instead of ignoring invalid from parameters.