[#1399] Added `ahoy fetch-db` as an alias to `ahoy download-db`.

[AlexSkrypnyk]

closes #1399

[codecov[bot]]

Codecov Report

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

Project coverage is 67.34%. Comparing base (935c62d) to head (af7d2ab). Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1402 +/- ## ============================================ + Coverage 57.07% 67.34% +10.26% ============================================ Files 41 41 Lines 3059 3059 ============================================ + Hits 1746 2060 +314 + Misses 1313 999 -314 ```

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