Support bool and float constants in msg files

tests/test_parse.py

@@ -17,7 +17,9 @@ from rosbags.typesys.types import FIELDDEFS
 MSG = """
 # comment
 
+bool b=true
 int32 global=42
+float32 f=1.33
 string str= foo bar\t
 
 std_msgs/Header header
@@ -195,7 +197,12 @@ def test_parse_msg() -> None:
     ret = get_types_from_msg(MSG, 'test_msgs/msg/Foo')
     assert 'test_msgs/msg/Foo' in ret
     consts, fields = ret['test_msgs/msg/Foo']
-    assert consts == [('global', 'int32', 42), ('str', 'string', 'foo bar')]
+    assert consts == [
+        ('b', 'bool', True),
+        ('global', 'int32', 42),
+        ('f', 'float32', 1.33),
+        ('str', 'string', 'foo bar'),
+    ]
     assert fields[0][0] == 'header'
     assert fields[0][1][1] == 'std_msgs/msg/Header'
     assert fields[1][0] == 'bool'