v0.3.0

Added

• Support indel stitching in AlphaGenome variant prediction and enable it by
  default.
• Support calculating variant score quantiles.
• Export .pyi files for generated protocol buffers.

Changed

• Improvements for fine-tuning (per-head loss weights, target smoothing,
  splicing ROPE initialization and BatchNorm training mode)
• Migrate to use FastaExtractor from alphagenome.
• Use variant.start to calculate the middle of the center mask.
• Fix negative strand bug for score_interval and score_variant.
• Update type annotations and fix typing errors.