DM-45725: Change default table engine to MyISAM

[JeremyMcCormick]

Change the default MySQL table engine to MyISAM in the data model, for two main reasons:

• This is the table engine used by Qserv, so we want to match it as closely as possible.
• Some of the tables are exceeding the maximum number of columns allowed by the InnoDB engine.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.74%. Comparing base (a4a3dd8) to head (266d708).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   90.80%   90.74%   -0.06%     
==========================================
  Files          16       16              
  Lines        1805     1805              
  Branches      386      386              
==========================================
- Hits         1639     1638       -1     
  Misses        101      101              
- Partials       65       66       +1     

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[gpdf]

LGTM, matching Qserv is reasonable