Progress bar during freeze / Feedpack when saving a huge project

[Semnodime]

Is your feature request related to a problem? Please describe. When saving a huge project, Cutter freezes and does not provide any feedback about progress and does not allow to abort saving (or interact in any way).

Describe the solution you'd like A progress bar or any other graphical change like graying out the interface via some overlay should notify the user that the saving is in progress and maybe even allow to estimate how long it will take (bytes written, bytes to come / percentage of object serialized / ...). Maybe an option to further interact with Cutter during saving, like abort button.

Describe alternatives you've considered None

Additional context None