teal.picks 0.1.0.9235

Added picks(), datasets(), variables(), and values() functions for defining hierarchical data selections (dataset -> variable -> value).
Added picks_ui() and picks_srv() Shiny modules for interactive selection widgets with badge drop-down UI.
Added resolver() to resolve delayed and dynamic choices using tidyselect expressions and predicate functions.
Added merge_srv() for merging multiple datasets based on picks selections, with automatic join key detection and conflict resolution.
Added tm_merge() teal module for interactive dataset merging with generated R code.
Added as.picks() for converting teal.transform::data_extract_spec objects to picks.
Added teal_transform_filter() for creating filter transformers from picks selections.
Added is_categorical() tidyselect helper for selecting categorical variables with cardinality constraints.

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