Simplifies `JoinKeys` from R6 to S3 list-like object #610

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1 error and 5 warnings

Process completed with exit code 1.

file=R/cdisc_data.R,line=95,col=5,[commented_code_linter] Commented code should be removed.

file=tests/testthat/helper-compare.R,line=14,col=1,[object_name_linter] Variable and function name style should match snake_case or symbols.

file=tests/testthat/test-join_keys.R,line=331,col=3,[commented_code_linter] Commented code should be removed.

file=tests/testthat/test-parents.R,line=3,col=3,[commented_code_linter] Commented code should be removed.

file=tests/testthat/test-parents.R,line=121,col=3,[commented_code_linter] Commented code should be removed.