Support more CREATE/ALTER/DROP statements

[lu-zero]

We might want to provide a knob to decide if the the arguments of ALTER TABLE should be considered top level or not.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.27%. Comparing base (832fa6e) to head (8ee53ca).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   99.26%   99.27%   +0.01%     
==========================================
  Files           6        6              
  Lines        3785     3856      +71     
  Branches     3785     3856      +71     
==========================================
+ Hits         3757     3828      +71     
  Misses         20       20              
  Partials        8        8              

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[shssoichiro]

An option to toggle having the args as top level would be a good idea, since some style guides prefer that. It can be a follow up PR.