Improve data getter functionality

[tasansal]

tl;dr

• Return traces/headers etc., in user-requested order.
• Allow ndarray indexing
• Consolidate int, ndarray, and list indexing to a single function

If users asked for traces in descending or random order, the read optimizations returned traces/headers in an unexpectedly sorted order. We now return in the same order the user asked for.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.18%. Comparing base (5753b40) to head (53b79e2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
+ Coverage   94.98%   95.18%   +0.19%     
==========================================
  Files          47       47              
  Lines        2135     2140       +5     
  Branches      253      251       -2     
==========================================
+ Hits         2028     2037       +9     
+ Misses         81       79       -2     
+ Partials       26       24       -2     

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