Add runtime parameter to toggle index scan optimizations

[RobinTF]

This parameter can be used for performance comparisons and for debugging.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.31%. Comparing base (14f638e) to head (55f4e73). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1509 +/- ## ======================================= Coverage 94.30% 94.31% ======================================= Files 350 350 Lines 25921 25923 +2 Branches 3485 3486 +1 ======================================= + Hits 24446 24448 +2 Misses 1433 1433 Partials 42 42 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud