feat: support for mapping inner nullable types in arrays

[asadali214]

What

This PR adds the support for mapping the inner nullable types in array types in responses

Why

There were few types that we were missing the mapping support, we were required to implement its support

Closes #51

Type of change

Select multiple if applicable.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause a breaking change)
• Tests (adds or updates tests)
• Documentation (adds or updates documentation)
• Refactor (style improvements, performance improvements, code refactoring)
• Revert (reverts a commit)
• CI/Build (adds or updates a script, change in external dependencies)

Dependency Change

N/A

Breaking change

N/A

Testing

Unit tests were added to test this feature's implementation

Checklist

• My code follows the coding conventions
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added new unit tests

[sufyankhanrao]

Above mentioned comments need your attention.

[sonarqubecloud]

Quality Gate failed

Failed conditions
4.7% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[sufyankhanrao]

LGTM