Remove cudf._lib.string_casting in favor of inlining pylibcudf (#17460)

Contributes to #17317

Authors:
  - Matthew Roeschke (https://github.com/mroeschke)

Approvers:
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #17460

Author: mroeschke

python/cudf/cudf/_lib/CMakeLists.txt

@@ -12,8 +12,8 @@
 # the License.
 # =============================================================================
 
-set(cython_sources column.pyx groupby.pyx interop.pyx scalar.pyx string_casting.pyx strings_udf.pyx
-                   types.pyx utils.pyx
+set(cython_sources column.pyx groupby.pyx interop.pyx scalar.pyx strings_udf.pyx types.pyx
+                   utils.pyx
 )
 set(linked_libraries cudf::cudf)
 

python/cudf/cudf/_lib/__init__.py

@@ -4,7 +4,6 @@
 from . import (
     groupby,
     interop,
-    string_casting,
     strings_udf,
 )