Add support for SQL server regexp functions (#1689)

Fixes #1671

Author: hadley

NEWS.md

@@ -1,5 +1,6 @@
 # dbplyr (development version)
 
+* SQL Server 2025 (version 17.0) now supports stringr regex functions: `str_detect()`, `str_starts()`, `str_ends()`, `str_replace()`, `str_replace_all()`, `str_remove()`, `str_remove_all()`, `str_extract()`, and `str_count()`. Fixed pattern versions of `str_detect()`, `str_starts()`, and `str_ends()` work on all SQL Server versions (#1671).
 * MS Access now correctly generates SQL for multiple joins by adding required parentheses (#1576).
 * `.data$col`, `.data[[col]]`, `.env$var`, and `.env$[[var]]` now work correctly inside `across()` (#1520).
 * New `.sql` pronoun makes it a little easier to use known SQL functions in packages, requiring only `@importFrom dbplyr .sql` (#1117).