Handle parentheses around MatchSequence more correctly

[lieryan]

Description

Handle various corner cases around MatchSequence. It's complicated by the fact that the MatchSequence syntax allows multiple kinds of parentheses and even no parentheses and the ast doesn't give us any clue which is being used.

Checklist (delete if not relevant):

• I have added tests that prove my fix is effective or that my feature works
• I have updated CHANGELOG.md

[codecov]

Codecov Report

❌ Patch coverage is 97.97980% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.28%. Comparing base (5ad2c6a) to head (2d52f55).
⚠️ Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
rope/refactor/patchedast.py	88.88%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #863   +/-   ##
=======================================
  Coverage   95.28%   95.28%           
=======================================
  Files         134      134           
  Lines       26442    26534   +92     
=======================================
+ Hits        25194    25284   +90     
- Misses       1248     1250    +2     

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