Fix tidy3d holes

[tvt173]

properly removes holes from shapely shapes, such as rings

fixes #565

Summary by Sourcery

Improve handling of geometric shapes in Tidy3D component by removing holes and simplifying geometry processing

Bug Fixes:

• Fixed issue with polygon processing by using buffer method to remove holes and simplify shapes

Enhancements:

• Refactored polyslabs generation to use more robust geometry conversion
• Simplified plotting and geometry intersection logic

Chores:

• Removed redundant get_vertices method from base component class

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