feat(framework): CLDR location can now be specified

[vladitasev]

The asset registry: @ui5/webcomponents-base/dist/AssetRegistry.js now exports a new method:

registerCldrMappingFunction

that can be used to specify custom paths to the CLDR assets whenever they are not bundled.

Example usage:

import { registerCldrMappingFunction } from "@ui5/webcomponents-base/dist/AssetRegistry.js";

registerCldrMappingFunction(locale => {
	return `https://unpkg.com/@ui5/webcomponents-localization@0.19.0/dist/generated/assets/cldr/${locale}.json`
});

closes: #1524