Add line history view

[jlynchMicron]

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Is your feature request related to a problem? Please describe. This is not a problem with the current extension. When working on large files in SVN that a lot of people touch, it is helpful to have a line history view instead of wadding through a sea of commit history to see when the section of code you are looking at was last touched.

Describe the solution you'd like Please implement a line history view. You could look at gitlens implementation of it as a good example of what it could look like. https://github.com/eamodio/vscode-gitlens/issues/354

Describe alternatives you've considered The only alternative I have considered is opening pycharm to just look at SVN line history because I know it has that feature. I prefer to stay working in VScode if I can.