Semantic link functions for holidays

The `semantic-link-functions-holidays` library provides semantic functions, such as `is_holiday`, that enable the enrichment of a FabricDataFrame with public holiday information. It is part of the broader Microsoft Fabric semantic link feature, designed to bridge Power BI datasets and Synapse Data Science notebooks. The current version is 0.14.0, released on March 17, 2026, with updates typically tied to the `semantic-link` project's release cadence.