New Rule: implicit case default -- updated implementation

[ShreChinno]

Updated Implementation

• Populates a list of LHS variables once encountered in always construct block
• Checks if default case exists and sets bool to true
• Goes through each declaration within case item and compares with LHS variable list
• If does not exist, return fail, but if default exists, return pass, otherwise, return fail

Relevant Issues

• New Rule: Implicit case default dalance/svlint#268

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.51%. Comparing base (1e9c772) to head (3d48239).

❗ Current head 3d48239 differs from pull request most recent head 611c74f. Consider uploading reports for the commit 611c74f to get more accurate results

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Additional details and impacted files

@@                    Coverage Diff                    @@
##           implicit_case_default       #5      +/-   ##
=========================================================
- Coverage                  86.68%   86.51%   -0.18%     
=========================================================
  Files                        156      156              
  Lines                       8121     7965     -156     
=========================================================
- Hits                        7040     6891     -149     
+ Misses                      1081     1074       -7     

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[ronitnallagatla]

Hint is probably too long. Might need to wrap at 80 chars