Add MonitorType.ORACLEDB and reorder enum

[tr4nt0r]

Add monitor type oracledb and reorganize enum grouped like in Uptime Kuma frontend dropdown

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.82%. Comparing base (d61f5d8) to head (d9ffa55).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
+ Coverage   91.77%   91.82%   +0.05%     
==========================================
  Files           5        5              
  Lines         158      159       +1     
==========================================
+ Hits          145      146       +1     
  Misses         13       13              

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