Missing methods to get the actual components

[felldo]

The HighLevelComponent and LowLevelComponent interfaces are currently missing methods to get the components like ActionRow or Button.
Possible solutions are to avoid the current methods at all which return i.e. List<HighLevelComponent> and instead offer direct acces to the HighLevelComponents with List<ActionRow> getActionRows() or offer as methods(like we currently also offer for receiving interactions) which are better maintainable as we do not have to add any other methods if there are new component types but on the other side they are not that nice to use as you have to know which classes are possible.