Deprecate reading literal string in cudf.read_json

[galipremsagar]

Description

This PR deprecates reading literal strings in read_json, instead users will need to pass StringIO for these cases to silence the warning.

This change is to match: pandas-dev/pandas#53409

On pandas_2.0_feature_branch:

= 501 failed, 101106 passed, 2071 skipped, 786 xfailed, 312 xpassed, 20 errors in 1234.91s (0:20:34) =

This PR:

= 426 failed, 101181 passed, 2091 skipped, 786 xfailed, 312 xpassed in 1126.93s (0:18:46) =

Checklist

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

[vuule]

Will this eventually remove the weird logic where pandas tries to read the input both as raw data and as file name?

[mroeschke]

pandas has deprecated read_foo(data=... where data is "raw data" instead of a file in 2.1 IIRC, so when pandas 3.0 is the minimum supported version this can be removed