add live poly a and skip poly a feature

[satriobio]

• crude, signal-space, live poly-a length estimation
• skip basecall when chunks is poly-a sequence

[Adoni5]

HI @satriobio, can you add docstrings to the function and module for Stringray, so it's easier to understand what it is doing?

A good example is targets.py, with the module level docstring at the top and the functions having individal docstrings.

Also code like this that doesn't rely on outside tools too much is a great candidate for Unit/DocTests - examples of which can be found here https://github.com/LooseLab/readfish/blob/778d260d2717117b8daa09177f4287026b0b0fe2/src/readfish/plugins/utils.py#L106-L123

We use pytest for performing these tests, which can be set up locally as detailed in the CONTRIBUTING.md and in greater detail in the online documentation.

Also one thing I recommend is to use pre-commit locally as detailed in the developer documentation, and set the hooks for pre-commit and pre-push, helps you keep your code tidy as you go!

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