🦴 Adds Simulator from OpenQuadruped/spot_mini_mini

mock/simulator/mini_ros/msg/JointAngles.msg

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+# FL
+# Shoulder or x
+float32 fls
+# Elbow or y
+float32 fle
+# Wrist or z
+float32 flw
+
+# FR
+# Shoulder or x
+float32 frs
+# Elbow or y
+float32 fre
+# Wrist or z
+float32 frw
+
+# BL
+# Shoulder or x
+float32 bls
+# Elbow or y
+float32 ble
+# Wrist or z
+float32 blw
+
+# BR
+# Shoulder or x
+float32 brs
+# Elbow or y
+float32 bre
+# Wrist or z
+float32 brw
+
+# Move Type (for servo smoothness)
+# step is 0
+# view is 1
+bool step_or_view