Space-ouija

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* Fix writing empty attributes strings (ensure numElements cdf fields > 0)
* set_values assume values=[] if only data_type is provided
* Attributes values reset, user can now change attributes values once set

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* Fixes + Unfinished skeletons export
* Adds Python 3.12 support.
* Builds with O3 optimizations instead of O2.
* Always expose record count as first dimension (even with NRV variables)

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* Add support for writing CDF files.
* Add support for lazy loading variables (default behavior now).
* Read performances improvements.
* Exposes string variables values as numpy array of unencoded strings by default (.values).
* Add support for encoding string variables values (.values_encoded).
* Exposes CDF version, compression, majority,...

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* Fixes Windows 'access violation' error.

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* Mostly CI refactoring.

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* Packaging fix.