Add dynamic resampling for large Plotly datasets

[evnchn]

Motivation

Fixes #3340, where the UI grinds to a halt when the Ploty chart has a large dataset.

Implementation

Implement LTTB (Largest Triangle Three Buckets) algorithm for automatic downsampling of large time series data in Plotly charts.

• Add n_samples parameter to ui.plotly() to enable dynamic resampling
• Resample data on zoom/pan via plotly_relayout events
• Include pure NumPy LTTB implementation as fallback
• Support optional tsdownsample package for faster Rust-based downsampling

Progress

• I chose a meaningful title that completes the sentence: "If applied, this PR will..."
• The implementation is complete.
• If this PR addresses a security issue, it has been coordinated via the security advisory process.
• Pytests is a tough one. How do we validate that the resampling took place?
• Explicit documentation is not necessary because the option is documented in the options
  • Nevertheless I think maybe let's showcase this functionality