Add vscode devcontainer / github codespaces

[sduquemesa]

Context:
Have you dream of having many and completely environments (down to the operative system) on your local machine or even making changes to the walrus online?

Description of the Change:
This PR implements a fully furnished vscode devcontainer.

Benefits:

• Can create fully reproducible environments on different machines
• Enables (paid) github codespaces
• Allows you to run/debug the walrus on linux even when on a mac or windows machine

How-to?

• To try it out the devcontainer locally on vscode follow the instructions here,
• Use (paid, yes you pay so be careful with usage) github codespaces
  
  
  

Possible Drawbacks:
🤷

Related GitHub Issues:
None

[sduquemesa]

I have added this PR mainly for convenience: this is how I run and debug the walrus on linux while using a mac machine. This PR does not have yet a reviewer — if you think this is useful and can review it, go for it!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (544c457) 100.00% compared to head (436403a) 100.00%.
Report is 1 commits behind head on master.

❗ Current head 436403a differs from pull request most recent head 665e9df. Consider uploading reports for the commit 665e9df to get more accurate results

Additional details and impacted files

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##            master      #370   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           28        28           
  Lines         1963      1963           
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  Hits          1963      1963           

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