DG: Add delete feature

[tllshan]

• Add implementation for delete in DG
• Add sequence diagrams for the parsing and execution of a delete command
  
  

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d2de58) 82.29% compared to head (ae6d80a) 82.29%.

❗ Current head ae6d80a differs from pull request most recent head 768b6ba. Consider uploading reports for the commit 768b6ba to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #146   +/-   ##
=========================================
  Coverage     82.29%   82.29%           
  Complexity      844      844           
=========================================
  Files           118      118           
  Lines          2610     2610           
  Branches        319      319           
=========================================
  Hits           2148     2148           
  Misses          398      398           
  Partials         64       64           

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[p-xp]

LGTM, just a few nits!