能否给axisPointer的label 增加一个align，而且 label 中的padding 设置并不生效，当左右两个值不相同时

[CorruptKubCzh]

What problem does this feature solve?

在使用axisPointer.label 时，如果 文字内容被要求多行显示时，可以不再是居中显示

What does the proposed API look like?

https://gallery.echartsjs.com/editor.html?c=xVszi2WnZ3&comment=0

app.title = '多 X 轴示例';
var colors = ['#5793f3', '#d14a61', '#675bba'];
option = {
color: colors,

tooltip: {
    trigger: 'none',
    axisPointer: {
        type: 'cross'
    }
},
legend: {
    data: ['2015 降水量', '2016 降水量']
},
grid: {
    top: 70,
    bottom: 90
},
xAxis: [{
        type: 'category',
        axisTick: {
            alignWithLabel: true
        },
        axisLine: {
            onZero: false,
            lineStyle: {
                color: colors[1]
            }
        },
        axisPointer: {
            label: {
                formatter: function(params) {
                    return '降水量 '   params.value  
                        (params.seriesData.length ? '：'   params.seriesData[0].data : '');
                },
                margin: 60,
                align: 'left',
                padding: [
                    5, // 上
                    60, // 右
                    5, // 下
                    0, // 左
                ]
            }
        },
        data: ["2016-1", "2016-2", "2016-3", "2016-4", "2016-5", "2016-6", "2016-7", "2016-8", "2016-9", "2016-10", "2016-11", "2016-12"]
    },
    {
        type: 'category',
        axisTick: {
            alignWithLabel: true
        },
        axisLine: {
            onZero: false,
            lineStyle: {
                color: colors[0]
            }
        },
        axisPointer: {
            label: {
                formatter: function(params) {
                    return '降水量  '   params.value  
                        (params.seriesData.length ? '：'   params.seriesData[0].data : '');
                }
            }
        },
        data: ["2015-1", "2015-2", "2015-3", "2015-4", "2015-5", "2015-6", "2015-7", "2015-8", "2015-9", "2015-10", "2015-11", "2015-12"]
    }
],
yAxis: [{
    type: 'value'
}],
series: [{
        name: '2015 降水量',
        type: 'line',
        xAxisIndex: 1,
        smooth: true,
        data: [2.6, 5.9, 9.0, 26.4, 28.7, 70.7, 175.6, 182.2, 48.7, 18.8, 6.0, 2.3]
    },
    {
        name: '2016 降水量',
        type: 'line',
        smooth: true,
        data: [3.9, 5.9, 11.1, 18.7, 48.3, 69.2, 231.6, 46.6, 55.4, 18.4, 10.3, 0.7]
    }
]

};

[echarts-bot]

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[Ovilia]

配置项中没有看到 align 选项，但是现在 padding 没有 work 可能是 bug