Feat: Add --hierarchy flag for showing parent context lines

[yash3605]

Implemented Feature suggested in Issue: #3395.

I was able to do it using a simple Stack. what I did was that - when we're reading file, we check the indentation of each line. if the indentation of current line is less than the previous ones then we Pop them from the stack otherwise we push. and when I match is found the Stack is printed as it is.

what I couldn't do was implementing the Stack thing via StandardSink or Sink. because the code base is modular and tightly coupled and I was facing some ownership issues when borrowing StandardSink and others. So I had to create the stack separately and then pass it forward by some workarounds like creating a SinkWrapper for Sink and then Pass the Map I have made for the output.

Same with Printing the final result. I could have used WriteColor trait but I was facing same Ownership issues and I couldn't borrow another mutable reference so here I went with plain Println!() statement.

Before Hierarchy:

After Hierarchy (in Debug mode):

After Hierarchy (in build/release):

[yash3605]

This last ci/test error is due to Github Actions Infrastructure. I have fixed most issues in ci.