🔎 Update SequenceSet#inspect output format

Similarly to how `#inspect` already outputs frozen sets as valid ruby to
recreate an identical set, with `Net::IMAP::SequenceSet[str]`, now we do
that for mutuble sets too, with `Net::IMAP::SequenceSet(str)`.

Author: nevans

lib/net/imap/sequence_set.rb

@@ -1648,9 +1648,9 @@ def normalized_string
       #
       def inspect
         if empty?
-          (frozen? ? "%s.empty" : "#<%s empty>") % [self.class]
+          (frozen? ? "%s.empty" : "%s()") % [self.class]
         else
-          (frozen? ? "%s[%p]" : "#<%s %p>") % [self.class, to_s]
+          (frozen? ? "%s[%p]" : "%s(%p)") % [self.class, to_s]
         end
       end
 

test/net/imap/test_sequence_set.rb

@@ -888,11 +888,11 @@ def obj.to_sequence_set; 192_168.001_255 end
 
   data(
     # desc         => [expected, input, freeze]
-    "empty"        => ["#<Net::IMAP::SequenceSet empty>",   nil],
+    "empty"        => ["Net::IMAP::SequenceSet()",          nil],
     "frozen empty" => ["Net::IMAP::SequenceSet.empty",      nil, true],
-    "normalized"   => ['#<Net::IMAP::SequenceSet "1:2">',   [2, 1]],
-    "denormalized" => ['#<Net::IMAP::SequenceSet "2,1">',   "2,1"],
-    "star"         => ['#<Net::IMAP::SequenceSet "*">',     "*"],
+    "normalized"   => ['Net::IMAP::SequenceSet("1:2")',   [2, 1]],
+    "denormalized" => ['Net::IMAP::SequenceSet("2,1")',   "2,1"],
+    "star"         => ['Net::IMAP::SequenceSet("*")',     "*"],
     "frozen"       => ['Net::IMAP::SequenceSet["1,3,5:*"]', [1, 3, 5..], true],
   )
   def test_inspect((expected, input, freeze))