New dyn refs

[Ygg01]

Dynamic Reference feature

Adds Message Reference as mentioned in #27

Following expressions are now legal is isExperimenal flag in FluentBundle is enabled. It defaults to false.

Message bundle:

# example.ftl
cat = {$number ->
  *[one] Cat
  [other] Cats
}
dog = {$number -> 
  *[one] Dog
  [other] Dogs
}

attack-log = { $$attacker(number: $atk_num) } attacked {$$defender(number: $def_num)}.

Can be parsed as:

var bundle = LinguiniBuilder.Builder(isExperimenal = true)
                .Locales(locales)
                .SkipResources(example)
                .UncheckedBuild();
var actual = bundle.GetAttrMessage("attack-log", ("cat", (FluentNumber) 1), ("dog", (FluentNumber) 2));

Assert.AreEqual("Cat attacked Dogs", actual);

Dynamic reference attributes

In addition to dynamic references, dynamic references will also use their attribute if available:

-creature-fairy = fairy
-creature-elf = elf
   .StartsWith = vowel

you-see = You see { $$object.StartsWith ->
    [vowel] an { $$object }
    *[consonant] a { $$object }
}.

Will dynamically change its attributes:

var elf = bundle.GetAttrMessage("you-see", ("object", "elf"));
var fairy= bundle.GetAttrMessage("you-see", ("object", "fairy"));

Assert.AreEqual("You see an elf", elf);
Assert.AreEqual("You see a fairy", fairy);

Closes #27

[github-actions]

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