feat(ui5-upload-collection-item): implement keyboard handling

[fifoosid]

This change improves editing the name of file in ui5-upload-collection-item. On enter in the input and pressing the rename button, the name is saved. On pressing cancel in the input or escape the name is not changed.

Part of #1534

[vladitasev]

There are 2 bugs:

• Esc doesn't close the rename input
• When you press Enter after file rename, the focus is lost. The correct behavior is to set the focus on the whole item.

[vladitasev]

We never check for parentElement, this is an antipattern. Lists have similar interactions and they always use events. This way, even if children are slotted, it still works.
@ilhan007 can maybe point to examples?

In addition, clicking the Rename button with mouse (not enter) loses focus.

[vladitasev]

Final step :) looks much better, please make this more generic
I've proposed a name that would fit and be universal and usable for others as well