[RFC]: add `constants/float32/pi-squared`

[Neerajpathak07]

Description

This RFC proposes

• To add constants/float32/pi-squared to expand the scope for float32 operations.

var bool = ( FLOAT32_PI_SQUARED === 9.869604110717773 );
// returns true

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• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.