Improve the lookup & usage of Taxon names

[mihow]

Summary

Some improvements to support #621 to return the same "Moth" and "Not a Moth" species records rather than creating new ones.

First use of our species search field!
Requires adding moth and nonmoth to search_names in the live DB, unless we add a data migration. A data migration may be worth it to merge existing records as well.

Goes with RolnickLab/ami-data-companion#70

Changes

• Search the "search_names" field in addition to the name field so that we can name taxa differently than the backend returns them (nonmoth & non-moth should both map to "Not-a-moth"
• Search only taxa that are set to "Active"
• Update the searches happening in two places:
• 1. the main determination of a prediction when processing results are being processed (a single Taxon gets looked up & associated with the Occurrence)
• 2. when the top-N or more prediction results are mapped to taxa objects
• Fix the performance of the Django admin Taxon page, use an autocomplete field instead of a massive & slow drop-down of taxa choices.

Follow-ups

• Search names & search_names of synonym children as well

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