fix: Code improvements for boxable expressions.

[dracarys18]

Feature Description

Replace Boxed queries used for filter payment intent by constraints by Boxable Expressions.

Possible Implementation

This depends on Rust Issue 52662 to get stable. It can be done after this issue gets merged into stable

Have you spent some time to check if this feature request has been raised before?

• I checked and didn't find similar issue

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to submit a PR?

Yes I am willing to submit a PR!