Fix the IBL Cbin extractor so that it works with 4 split shanks as well

[rai-pranav]

The .meta file that is produced when converting the Np2 probes to 4 individual shanks does not contain the ~ sign in front of the fileds which are lists, and hence the read_meta_file function from neo.rawio.spikeglxrawio fails. So I have written some functions which can handle this version of the meta file.

[rai-pranav]

Hi @alejoe91
I have created this PR to fix some IBL specific loading of the Np2 4 shanks dataset.
Some of the windows OS tests are failing which I don't think are related to the my changes. Any hints on how to resolve them?

[chrishalcrow]

Hello, I think the test failure was related to a downstream cache test failure here: https://github.com/SpikeInterface/spikeinterface/actions/runs/24997078165
I reran the caching successfully here: https://github.com/SpikeInterface/spikeinterface/actions/runs/25054593823
Which seems to have fixed the git-annex install here.
I'm not sure how to make this more robust, but at least the tests are passing now!

[rai-pranav]

I cannot directly assign reviewers to this PR.
Can someone please review this PR ? @chrishalcrow @alejoe91 🙏