Add support for sqlite citext data-type

[jusguy]

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• Does npm run test or npm run test-DIALECT pass with this change (including linting)?
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Description of change

#10024 added CITETXT for Postgres.

This isn't a real data-type in SQLite but uses COLLATE NOCASE on the TEXT field. The behavior is the same as CITEXT for Postgres with the exception of SQLite only supporting ASCII characters.

[codecov]

Codecov Report

Merging #10036 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #10036      +/-   ##
==========================================
+ Coverage    96.3%    96.3%   +<.01%     
==========================================
  Files          63       63              
  Lines        9421     9427       +6     
==========================================
+ Hits         9073     9079       +6     
  Misses        348      348

Impacted Files	Coverage Δ
lib/data-types.js	95.21% <ø> (ø)	⬆️
lib/instance-validator.js	97.54% <100%> (ø)	⬆️
lib/dialects/sqlite/data-types.js	97.15% <100%> (+0.1%)	⬆️

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[sushantdhiman]

Thanks @justinkalland