Describe your changes

Modernizes st.scatter_chart width/height parameters to use the new Width/Height type system ("stretch", "content", or pixel values) for consistency with other chart elements.

Changes Made:

• Updated parameter signature: width: Width = "stretch" and height: Height = "content" (previously int | None = None)
• Deprecated use_container_width: Changed from bool = True to bool | None = None with deprecation warnings
• Preserved backward compatibility: Existing integer values and use_container_width behavior still work
• Updated documentation: New parameter descriptions explaining the Width/Height type system

Deprecation Details:

• use_container_width will be removed after 2025-12-31
• When explicitly set, use_container_width takes precedence over width
• Users receive deprecation warnings with migration guidance

GitHub Issue Link (if applicable)

Testing Plan

• Unit Tests (Python) - Width/height parameter functionality and backward compatibility
• Unit Tests (Python) - use_container_width deprecation warnings and behavior
• E2E Tests - Testing for width/height behavior across different values (covered by existing tests, new tests for height="content" and height="stretch")
• Manual testing completed

Additional Notes:

Part of the AdvancedLayouts initiative to provide consistent width/height APIs across all chart elements.

Contribution License Agreement

By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.