Feat (equalize): enable parametrized scales

[pablomlago]

Reason for this PR

Enable parametrized scaling, similarly to rotations (see #1148).

Changes Made in this PR

Refactored the function _cross_layer_equalization and incorporated rewriters for handling fused/unfused scaling.

Testing Summary

Created a new test to verify that weights with fused/unfused scaling match.

Risk Highlight

• This PR includes code from another work (please detail).
• This PR contains API-breaking changes.
• This PR depends on work in another PR (please provide links/details).
• This PR introduces new dependencies (please detail).
• There are coverage gaps not covered by tests.
• Documentation updates required in subsequent PR.

Checklist

• Code comments added to any hard-to-understand areas, if applicable.
• Changes generate no new warnings.
• Updated any relevant tests, if applicable.
• No conflicts with destination dev branch.
• I reviewed my own code changes.
• Initial CI/CD passing.
• 1+ reviews given, and any review issues addressed and approved.
• Post-review full CI/CD passing.