Feat: Introduce dynamic property mixin and add dynamic props to native view

[onefloid]

What changed

• Introduce dynamic property mixin
• Add dynamic property support to native view

[MariusWirtz]

This looks a bit archaic, how we're constructing the JSON here via string concatenation.
This PR is a good opportunity to clean up this part of the code base.

[onefloid]

I thought this was best practice and the project’s recommended approach for building JSON via string concatenation😉
Resolved in def6d56

[Copilot]

Pull request overview

This PR introduces a shared mechanism to preserve “dynamic” (extra/unknown) REST properties on view objects and extends that support to NativeView, with accompanying unit/integration tests to validate round-tripping and REST retrieval.

Changes:

• Added DynamicPropertiesMixin to centralize storage and filtering of extra REST properties via .dynamic_properties.
• Updated MDXView and NativeView to use the mixin and include dynamic properties in (de)serialization.
• Added tests covering dynamic properties defaults, constructor behavior, serialization, and REST create/get for native views.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Tests/ViewService_test.py	Adds integration test that creates/retrieves/deletes a native view with dynamic properties.
Tests/NativeView_test.py	Adds unit tests for NativeView.dynamic_properties defaults, serialization, and from-dict behavior.
TM1py/Services/ViewService.py	Adjusts view retrieval to use shared dynamic property filtering for MDX/native views.
TM1py/Objects/NativeView.py	Adds dynamic property support and serializes filtered dynamic properties into the request body.
TM1py/Objects/MDXView.py	Refactors dynamic property handling to the shared mixin and shared filtering method.
TM1py/Objects/DynamicPropertiesMixin.py	New mixin providing .dynamic_properties and _filter_dynamic_properties().

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[onefloid]

@MariusWirtz This PR is ready for another review. I cleaned up the commit history and separated refactoring, test fixes, and the feature. I also added explanations to the commits, so it would be great if they could be preserved.