Add "Open Terminal Here" feature

This is equivalent to the "Open Terminal Here" feature that existed until Version 20.12.
BUG:452637

If the user has selected folders, replace "Open Terminal" in the context menu with "Open Terminal Here".
When more than 5 folders are selected, a modal window will ask the user if he is sure to open all 6 or more terminal windows.

In Detail View, users can also select a file, which will open a terminal at the location of that file.

summary

I got various advices and improved it, and it became such an MR.

• If the user has selected items, whether they are files or folders, open the terminal in the appropriate location.
• Users can also use the shortcut [Alt + Shift + F4] or from the toolbar.
• It can always be displayed in the context menu and no restrictions are required.