TODO: Implement more curve methods

[dastan-ansys]

📝 Description of the feature

Implement the following functions for curves:
- as_spline
- get_length
- get_polyline
- intersect_curve
- is_coincident

💡 Steps for implementing the feature

Each curve has its own version as these are abstract functions, so how it's implemented for line will be different for the others such as ellipse and circle.

🔗 Useful links and references

No response

[RobPasMue]

Applies to surfaces as well, right?