fix(query-interface): allow sequelize.fn and sequelize.literal in fields of IndexesOptions

[ssut]

Pull Request check-list

Please make sure to review and check all of these items:

• Does npm run test or npm run test-DIALECT pass with this change (including linting)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
• Have you added new tests to prevent regressions?
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Description of change

As far as I know, sequelize allows sequelize.fn and sequelize.literal to be used for indexes.fields when defining models, because I have seen that the current sequelize types seem it does not allow to do so, this pull request solves the problem.

(Documented on https://sequelize.org/master/class/lib/model.js~Model.html)

[codecov]

Codecov Report

Merging #12224 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #12224   +/-   ##
=======================================
  Coverage   96.33%   96.33%           
=======================================
  Files          95       95           
  Lines        9118     9118           
=======================================
  Hits         8784     8784           
  Misses        334      334           

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[SimonSchick]

Missing test, you also did not fill out the PR template correctly.

[ssut]

Missing test, you also did not fill out the PR template correctly.

I added a test for this pull request. Please check it.