refactor: rename Badge to TwitchBadge (#6706)

this change is made to clarify that the previously-called Badge object
is actually specialized for Twitch badges

src/providers/twitch/TwitchBadge.cpp

@@ -12,7 +12,7 @@ const QSet<QString> channelAuthority{"lead_moderator", "moderator", "vip",
                                      "broadcaster"};
 const QSet<QString> subBadges{"subscriber", "founder"};
 
-Badge::Badge(QString key, QString value)
+TwitchBadge::TwitchBadge(QString key, QString value)
     : key_(std::move(key))
     , value_(std::move(value))
 {
@@ -34,7 +34,7 @@ Badge::Badge(QString key, QString value)
     }
 }
 
-bool Badge::operator==(const Badge &other) const
+bool TwitchBadge::operator==(const TwitchBadge &other) const
 {
     return this->key_ == other.key_ && this->value_ == other.value_;
 }