Fix: Enhance nested JSON comparison in Contains function

[arielsepton]

Description

This PR addresses an issue where the provider's Contains function did not properly handle nested JSON structures. The updated logic ensures that nested maps within the PUT body are correctly compared with those in the GET response.

Changes

• Enhanced the Contains function to handle nested maps recursively.

Testing

• Verified the changes with test cases involving nested JSON structures.
• Ensured that the modified Contains function correctly identifies if the PUT body is contained within the GET response.

Impact

• This change improves the accuracy of state comparison for resources with nested JSON structures.
• The provider now more reliably maintains the desired state by accurately tracking resource modifications.

Notes

• Future considerations may include making this comparison behavior more configurable based on user feedback.

Closes #27