Add new FlascDataFrame object to enhance user interface with data (#…

…199)

* Adding at the root level for now; could consider moving to utilities/

* Ruff.

* precommit stuff.

* Add example notebook

* Add wide to long

* Add test

* Update README.md engagement

* Update README.md replacing 'FLORIS' typo

* Feature/add docstrings (#197)

* Update to 15 (#202)

* Update for PyPI installation. (#204)

* Update version number; ignore version.py for ruff.

* Adhere to FLASC formatting rules.

* psuedocode for conversions. Tests for saving dataframe to file.

* Print warning when to_feather used.

* String formatting.

* Add several more tests and n_turbines property.

* Adding TODOs for long/wide conversions.

* Clean up, a few more tests.

* Improved printout.

* ruff format.

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Co-authored-by: Paul <[email protected]>
Co-authored-by: christiannvaughn <[email protected]>