Added decorator as required by latest SpaCy

[soldni]

Hello!

In using pySBD, I've noticed that the current example script no longer works with the latest version of SpaCy (3.3.0). This is the traceback I get:

Traceback (most recent call last):
  File "/Users/lucas/Code/significant-statements-extraction/scripts/test_pysbd.py", line 27, in <module>
    nlp.add_pipe(pysbd_sentence_boundaries)
  File "/Users/lucas/miniforge3/envs/pytorch_p39/lib/python3.9/site-packages/spacy/language.py", line 773, in add_pipe
    raise ValueError(err)
ValueError: [E966] `nlp.add_pipe` now takes the string name of the registered component factory, not a callable component. Expected string, but got <function pysbd_sentence_boundaries at 0x11ffa9160> (name: 'None').

- If you created your component with `nlp.create_pipe('name')`: remove nlp.create_pipe and call `nlp.add_pipe('name')` instead.

- If you passed in a component like `TextCategorizer()`: call `nlp.add_pipe` with the string name instead, e.g. `nlp.add_pipe('textcat')`.

- If you're using a custom component: Add the decorator `@Language.component` (for function components) or `@Language.factory` (for class components / factories) to your custom component and assign it a name, e.g. `@Language.component('your_name')`. You can then run `nlp.add_pipe('your_name')` to add it to the pipeline.

This pull requests add a @Language.component decorator to make pySBD available in SpaCy again.