fix(ui5-icon): ui5-icon i18n works for all packages

[vladitasev]

This change removes the dependency of ui5-icon to the @ui5/webcomponents-icons package.

Changes:

• Each icon is now registered with the package name (new packageName property in icon data)
• Icon.js no longer fetches automatically the i18n assets for @ui5/webcomponents-icons, but rather fetches the ones for the currently loaded icon's package. This would make it possible to have other icon packages with i18n data rather than the first icons package only.
• For Icon.js the accessibleNameText is no longer a getter, but rather a metadata entity. This allows the Icon to be automatically invalidated once the i18n assets have been fetched and the acc text calculated.

Additional information: The first icon on the page may be invalidated up to 2 times. Firstly, if there is no data for the icon (the app did not load the icon individually), there will be a fetch for the icons bundle, and then the icon will be invalidated and actually painted with the SVG. Secondly, now that we have the icon's data, if the icon has an ACC text, and the app did not explicitly fetch the i18n bundle for the icon's package (which will almost always be the case), there will be a second fetch. After that - no requests will be done and all subsequent icons will be loaded normally.

closes: #2739