Deprecate strings_column_view::offsets_begin()

[davidwendt]

Description

Deprecates the cudf::strings_column_view::offsets_begin() and cudf::strings_column_view::offsets_end() since they are hardcoded to return size_type*. There are very few places that used these functions.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[davidwendt]

The calls in replace.cu and multi.cu have already been removed in #14824
I wanted to get this merged sooner than later before 24.04 finishes.

[davidwendt]

/merge