fix(types): add getForeignKeyReferencesForTable type

[nodejh]

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?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Did you update the typescript typings accordingly (if applicable)?
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Description of change

• Add missing getForeignKeyReferencesForTable type
• Add comments for getForeignKeysForTables method. There are no comments in the code so that there are no documentations in the QueryInterface API Reference: https://sequelize.org/v5/class/lib/query-interface.js~QueryInterface.html#instance-method-getForeignKeysForTables

[codecov]

Codecov Report

Merging #11738 into master will increase coverage by 0.42%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11738      +/-   ##
==========================================
+ Coverage   95.83%   96.26%   +0.42%     
==========================================
  Files          91       94       +3     
  Lines        8987     9190     +203     
==========================================
+ Hits         8613     8847     +234     
+ Misses        374      343      -31

Impacted Files	Coverage Δ
lib/query-interface.js	92.19% <ø> (+1.46%)	⬆️
lib/dialects/mariadb/index.js	100% <0%> (ø)
lib/dialects/mariadb/connection-manager.js	100% <0%> (ø)
lib/dialects/mariadb/query.js	87.96% <0%> (ø)
lib/sequelize.js	95.93% <0%> (+0.62%)	⬆️
lib/dialects/postgres/connection-manager.js	95.77% <0%> (+1.4%)	⬆️
lib/dialects/mariadb/data-types.js	100% <0%> (+49.01%)	⬆️
lib/dialects/mariadb/query-generator.js	100% <0%> (+85.71%)	⬆️

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