Progress bar or other progress indicators for possibly lengthy tasks like `aaa`

[Rot127]

Is your feature request related to a problem? Please describe.

While waiting for a 100MB+ file to be analyzed I wished for a progress bar to help maintain a peaceful mind.

It doesn't need to provide a estimated time when it's done (which is impossible for most tasks anyways). But watching some increasing numbers would be nice.

Describe the solution you'd like

E.g.

• When all flags with sym. are analyzed, we could have a progress bar showing the total numbers of symbols already processed.
• For emulation based analysis, a list of executed known and newly discovered functions would be nice.

Basically adding an API to show a linear progress for which 100% is known (progress bar).
Or update some numbers of the current task running.

Describe alternatives you've considered

Not adding it, because it consumes too many resources.

Additional context

Though with the introduction of RzIL long running task might become a common thing.
Providing some feedback, even if it doesn't include an estimated time when done.