Explicitly import extended functions

[jishnub]

I don't understand how these were working without being imported (see https://discourse.julialang.org/t/query-regarding-namespaces-when-adding-a-method-using-a-macro/115392), but these should be explicitly imported before being extended.

[codecov[bot]]

Codecov Report

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

Project coverage is 47.53%. Comparing base (023b1a4) to head (ee48c7d). Report is 10 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #656 +/- ## =========================================== - Coverage 75.20% 47.53% -27.68% =========================================== Files 79 79 Lines 8445 8430 -15 =========================================== - Hits 6351 4007 -2344 - Misses 2094 4423 +2329 ```

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