Expose stream parameter in public strings replace APIs

[davidwendt]

Description

Add stream parameter to public APIs:

• cudf::strings::replace() (x2)
• cudf::strings::replace_slice()
• cudf::strings::replace_re() (x2)
• cudf::strings::replace_with_backrefs()

Also cleaned up some of the doxygen comments and added stream-tests.

Reference #13744

Checklist

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

[hyperbolic2346]

So will the paradigm change in cudf to pulling out the detail namespace implementation into the main namespace since we no longer have the stream and mr hidden or will we keep the redirection into the detail namespace?

[davidwendt]

So will the paradigm change in cudf to pulling out the detail namespace implementation into the main namespace since we no longer have the stream and mr hidden or will we keep the redirection into the detail namespace?

No, the public APIs will continue to have the nvtx range calls to help with profiling.
#14263 (comment)

[davidwendt]

/merge