feat(scale): tickCount of log scale support -1

[pearmini]

• fix: 折线图设置base不成功 #4867
• fix(ticks): optimize log ticks scale#201

设置 log scale 的 tickCount 支持设置为 -1，从而自动计算 ticks，防止生成不均匀和冗余的 ticks。

export function mockPointLogTicks(): G2Spec {
  return {
    type: 'point',
    data: [
      [5, 0.09459459],
      [10, 0.22972973],
      [15, 0.36486486],
      [20, 0.5],
      [25, 0.63513514],
      [30, 0.77027027],
      [35, 0.90540541],
    ],
    encode: {
      x: (d) => d[0],
      y: (d) => d[1],
    },
    scale: {
      x: { type: 'log', nice: true},
      y: { type: 'log', domain: [0.001, 1] },
    },
    axis: {
      x: { tickCount: -1 },
      y: { tickCount: -1 }
    }
  };
}