Add methods to make human-readable conditional statements

For many of the climate graphics, we display information like the data collection metadata and the analysis period. But we currently don't output any text to indicate the application of conditional statements.

Because this text is something that many weather visualizations are likely to use, we should add a staticmethod to the BaseCollection class that can build these text statements. Instead of using the full name of the data type, we can use the abbreviation property to keep the statements short and easily readable.

Start with the BaseCollection class in ladybug/_datacollectionbase.py and inspect the abbreviation property in ladybug/datatype/base.py. Determine the conditional statements needed by the weather visualizations and how the existing collection and data-type APIs represent them. Done means the BaseCollection API can produce concise, human-readable text for applied conditional statements, with behavior covered by appropriate tests.