Feat/update to original mopo repo

[AuDuarte]

In order to stay up to date with the original repo, all changes were analyzed.

Direct changes from original

• Documentation file
• Vaadin 25 support
• Java updated from 17 to 21
• Client side error monitoring in Mopo class. Deprecation of assertNoJSErrors()
• Updated tests

GridPW

• GridPw.scrollToIndex() differs a bit. However, tests run succesfully using both the original and fork versions
• GridPw.getGridRows() is a fork-specific method, so not present in tests

Combobox

• Selection overlay is now located using "scroller" instead of overlay
• Multiselection is a fork-specific feature, so not present in tests

Note: Dramafinder also offers support for everything but Grid and Combobox. Besides support for many Vaadin elements, it also offers an abtract base IT class, among other features, like useful interfaces

DatePickerPW, DateTimePickerPW, TimePickerPW

DatePickerPW

FC's version had:

• dateFormat field(which had to be externally initialized)
• Page field, constructor with page and id

Viritin's version was kept for this class. While dateFormat adds the feature of handling different formats, it causes issues when running tests. This is at least due to not being initialized, but there may be other issues. Besides, this changes do not match what is offered by DateTimePickerPW.

TimePickerPW

• Has similar features to the ones discarded from DatePickerPW.
• Is fork-specific, so not present in tests

Additional features

• TestRunner and dependencies needed to boot the demo app and run tests.