Torch 2.0.0, biaffine parser improvements

Changed

• Change parser dependency relation prediction to use a biaffine layer rather than a pairwise biaffine layer. This simplified some code and can be slightly faster.
• Normalize distillation hidden layer loss using squared l2 norm.
• Update to libtorch 2.0.0 and
  tch 0.11.0.
• Update to clap 4.
• Update to sentencepiece 0.11.
• Absorb ohnomore into SyntaxDot.

Fixed

• Use the correct ID for unknown pieces in XlmRobertaTokenizer.
• Linux AArch64 builds.