Added functions related to the debugger into pingpong

[Cath3876]

I added the functions related to the new interceptor with the basic functionality to accept or decline events. In main.go of the pingpong application, I added a few lines to use this interceptor

[matejpavlovic]

Thanks for the PR Catherine!

Before I go through it, could you please rebase the debugger branch on top of visualization and make only the actual changes appear in a single commit? It seems like all but one of the commits here have already been merged as part of #524. The usual workflow is the following:

• Pull changes from the upstream branch (filecoin-project:visualization in our case) into andreaj00:visualization
• Commit your code to a new branch from there (i.e., the debugger branch would extend the visualization branch) or rebase the branch with the code on top of visualization
• Only then push.

This way, the PR will only show the relevant changes (and accidental overwriting of code with some old version is avoided too).

Also, the linter is complaining about this commit. You can see the errors either by running make lint in the mir directory (you need to have golangci-lint installed for that) or directly on GitHub, in the "Files changed" tab of this PR.

I'll have a look at the actual code as soon as these little issues are fixed.
Since you already pushed the current branch, you might need to do a force push instead of a normal one.