Route lexicographic preprocessing through memory resources

[nirandaperera]

Description

A part of #20780.

• Port lexicographic preprocessed_table, self_comparator, and two_table_comparator to take cudf::memory_resources.
• Route comparator-owned device state and preprocessing scratch through explicit output and temporary resources.
• Update sorting, joining, reduction, search, and row-operator callers and add strict current-resource test coverage.

Test plan

• Pre-commit checks on all changed files
• ROW_OPERATOR_TEST (53/53 passed)
• TABLE_TEST (32/32 passed)

Checklist

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

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