Report generation

[brandynlucca]

This PR adds:

• New reports generation module (echopop.extensions.FEATReports) which comprises a series of helper functions that all feed into a central FEATReports class
• The associated *.xlsx files are produced at the defined directory path via FEATReports.generate(), which can be tuned to produce a subset of the reports if needed
• Fleshed out docstring documentation
• An example notebook (and therefore documentation) to demonstrate how FEATReports is used for generating these reports

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[brandynlucca]

Creating a tracking checklist:

• [x] In-line changes
• [x] Module name
• [x] Report output folder
• [x] Report generation API
• [x] __METHOD_REFERENCE__