Quoting of option values is broken #1291
Description
In version 3.x you could execute a command using a quoted option value like that:
select --from some_table --where "counter=7"
In version 4.0.0, the quotes are ignored and the value for the where option is parsed to counter.
I did some debugging and found an issue in the class org.springframework.shell.core.command.DefaultCommandParser. In the parseOption method, the string containing the option name and the option value is split using word.split("="). This splits the quoted value, too. This seems unnecessary, as the entire input string was already split using a regular expression which checks for quoted parts of the string. Using word.split("=", 2) should return the correct result.
Additionally, I would recommend to make the regular expression used in the parse method a bit more robust by changing it from " (?=(?:[^"]*"[^"]*")*[^"]*$)" to "\s+(?=(?:[^"]*"[^"]*")*[^"]*$)". This would match one or more spaces.