Add revolute joint constraint for closed-loop hinges (#2252)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: jslee02

dart/constraint/Fwd.hpp

@@ -63,6 +63,7 @@ class JointLimitConstraint;
 class LCPSolver;
 
 class MimicMotorConstraint;
+class RevoluteJointConstraint;
 
 class PgsBoxedLcpSolver;
 class PGSLCPSolver;
@@ -94,6 +95,7 @@ DART_COMMON_DECLARE_SHARED_WEAK(JacobiBoxedLcpSolver)
 
 DART_COMMON_DECLARE_SHARED_WEAK(DynamicJointConstraint)
 DART_COMMON_DECLARE_SHARED_WEAK(BallJointConstraint)
+DART_COMMON_DECLARE_SHARED_WEAK(RevoluteJointConstraint)
 DART_COMMON_DECLARE_SHARED_WEAK(WeldJointConstraint)
 
 DART_COMMON_DECLARE_SHARED_WEAK(BalanceConstraint)