deal with long name searches

[nicpottier]

fixes this case:
https://sentry.io/nyaruka/textit/issues/529592597/

Which is caused by us creating ngrams for only the first 8 characters of each name. The search term however was going through the standard analyzer so wasn't matching due to that term being 9 characters. This PR changer our search analyzer to truncate the term at 8 chars. Added test as well.

Note this also changes the minimum name search length to be 2 chars.

[codecov-io]

Codecov Report

Merging #6 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   79.53%   79.53%           
=======================================
  Files           1        1           
  Lines         171      171           
=======================================
  Hits          136      136           
  Misses         20       20           
  Partials       15       15

Impacted Files	Coverage Δ
indexer.go	79.53% <ø> (ø)	⬆️

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