[New Rule] match with same arms

[sbrugman]

Explanation

Implement the checking for branches with identical arm bodies for match
Same benefits as #10

Python 3.10+

Example

# Bad
match hello:
   case "world":
        print("world")
    case "foobar":
       print("world")

# Good

match hello:
   case "world" | "foobar":
       print("world")