Create a function that filters out a list of state names into two categories based on the second parameter.
abbfullfilter_state_names(["Arizona", "CA", "NY", "Nevada"], "abb")
➞ ["CA", "NY"]
filter_state_names(["Arizona", "CA", "NY", "Nevada"], "full")
➞ ["Arizona", "Nevada"]
filter_state_names(["MT", "NJ", "TX", "ID", "IL"], "abb")
➞ ["MT", "NJ", "TX", "ID", "IL"]
filter_state_names(["MT", "NJ", "TX", "ID", "IL"], "full")
➞ []
State abbreviations will always be in uppercase.