Fast-ctc-decode

- PyPI _(+py3.10)_ & NPM builds.

- add wasm builds.

- options for none collapsing repeats with CTC search functions.
- greedy, beam, & duplex search for CTC-CRF transitions posteriors probability outputs.
- all search method no longer hold the Python GIL so can benefit from Python multithreading.
- Python3.5 supported dropped; Python 3.9 builds added.

- 2D Beam search
- Viterbi search.
- Optional phred quality scores.

- Support for multi-character labels *(`alphabet` can now be any `PySequence` type)*.
- On encountering NaNs a `RuntimeError` is raised.