Replace floatval() function by using direct type casting to (float)

[mage2pratik]

Description

Direct type casting is up to 6x faster than using casting functions like floatval(). So this pull request replaces the floatval() functions by direct type casting to (float).

Fixed Issues (if relevant)

1. Replace floatval() function by using direct type casting to (float)  #16848: Replace floatval() function by using direct type casting to (float)

Manual testing scenarios

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 @mage2pratik. Thank you for your contribution
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[magento-engcom-team]

Hi @mage2pratik. 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.