bug: tabulate viz & testing/usage examples

[lizgehret]

This PR fixes a couple of small bugs, and adds some additional testing.

The following bugs have been fixed:

• A bug in the tabulate visualizer that would fail to create a visualization if 'id' was not present within the input table. This machinery worked with the ancombc R package version 3.15, but the output was modified slightly in 3.16 and instead of an 'id' column, there is now a 'taxon' column that represents the feature IDs. The index column has been re-named 'feature-id' and the index is pulled by column location instead of 'id' within the visualizer.

• A bug that unintentionally writes the input.biom.tsv and input.map.txt files (used for ancombc inputs) to the user's CWD. This was originally added for de-bugging purposes and was never removed.

The following tests have been added:

• A usage example for qiime composition tabulate

• A unit test for the FrictionlessCSV -> DataFrame transformer

Some additional misc. items within this PR include:

• Updating naming conventions for usage examples, tests, and test data to specify the ancombc method (to prevent confusion between ancom and ancombc).

• Updating the copyright year to 2023

[lizgehret]

Here is what the updated output & resultant viz looks like:

[lizgehret]

Okay I think this is ready for a final review @ebolyen - I'm going to open a separate PR for the usage example that includes back ticks in the formula once I have #100 sorted, but the rest of this should be all set.

[lizgehret]

Note: the dataloaf output's index has been changed from feature-id to id since we are discouraging the use of dashes in metadata columns when using ancombc (due to the issues mentioned above).