Ensure integer values are not quoted as strings

[udovicic]

Description (*)

In cases where indexers does a filtering in the style of WHERE entity_id IN (...) there is a performance penalty if IDs are passed as strings, rather than integer values. This is especially visible on larger data sets. This pull request should cover some common occurrences of this.

This is based on the PR #18287 , as requested.

Fixed Issues (if relevant)

1. n/a

Manual testing scenarios (*)

1. n/a

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @udovicic. Thank you for your contribution
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[magento-engcom-team]

@udovicic thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[magento-engcom-team]

Hi @udovicic. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.