Implement `means_by_group()` #553

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1 error and 5 warnings

Process completed with exit code 31.

file=R/means_by_group.R,line=224,col=3,[object_name_linter] Variable and function name style should match snake_case or symbols.

file=tests/testthat/test-labelled_data.R,line=27,col=13,[undesirable_function_linter] Function "sapply" is undesirable.

file=tests/testthat/test-labelled_data.R,line=45,col=13,[undesirable_function_linter] Function "sapply" is undesirable.

file=tests/testthat/test-labelled_data.R,line=75,col=13,[undesirable_function_linter] Function "sapply" is undesirable.

file=tests/testthat/test-labelled_data.R,line=145,col=13,[undesirable_function_linter] Function "sapply" is undesirable.