Optimization: Remove unnecessary computation when cloning about hexapod

[mithi]

Linkage cloning

    cloneTrotShift(frame, tx = 0, ty = 0, tz = 0) {
        const pointsMap = LEG_POINT_TYPES.reduce((acc, pointType) => {
            const oldPoint = this.pointsMap[pointType]
            const newPoint = oldPoint.cloneTrotShift(frame, tx, ty, tz)
            acc[pointType] = newPoint
            return acc
        }, {})

        let clone = new Linkage(
            this.dimensions,
            this.position,
            this.bodyContactPoint,
            this.pose, 
            { hasNoPoints: false }
        )

        // override pointsMap of clone
        clone.pointsMap = pointsMap
        return clone
    }

New linkage constructor to remove computation

    constructor(
        dimensions = { coxia: 100, femur: 100, tibia: 100 },
        position = "linkage-position-not-defined",
        originPoint = { x: 0, y: 0, z: 0 },
        pose = { alpha: 0, beta: 0, gamma: 0 },
        flags = { hasNoPoints: false }
    ) {
        this.dimensions = dimensions
        this.pose = pose
        this.position = position
        if (hasNoPoints) { return }
        const pointNameIdMap = this._buildPointNameIdMap()
        this.pointsMap = this._computePoints(pose, pointNameIdMap, originPoint)
    }

[mithi]

867e5df