compares two polars dataframes for equality
equality in this case means that:

• both dfs must have the same columns: column names, dtypes, number of cols

• both dfs must have the same rows

• if the dfs have different columns they will not be checked for a difference in rows

• row and column order do not matter for row and column comparisons

  args:
  a: a pl.Dataframe
  b: a pl.Dataframe
  col_only: a boolean indicating whether only the columns should be checked
  write_csv: a boolean indicating whether or not to write csvs with the row differences, this is helpful when there are many row differences and the normal prints won't contain everything; defaults to False

  returns:
  True if the dataframes are equal, False if not
  prints the difference if False