(1) Make component tooltip inherit cascade correct: itemOption.tooltip -> componentOption.tooltip -> globalOption.tooltip
(previous incorrect cascade: itemOption.tooltip -> globalOption.tooltip
(2) Enable trigger component tooltip by chart.dispatchAction({ type: 'showTip', legendIndex: 0, name: 'some' });

To make (2) happen, this commit migrate `ECElement['tooltip']` to ECData['tooltipConfig']['option'],
and add other info in ECData['tooltipConfig']:
{
      componentMainType
      componentIndex
      name
}
to locate a tooltipable component element by a payload.

And add rule "no-var" to eslintrc

Use eslint rule to check the diff between var and let:
    "no-use-before-define": "off"
    "@typescript-eslint/no-use-before-define": 2
    no-redeclare: 2
    block-scoped-var: 2
    no-loop-func: 2
(2) By the way add some eslint rule and unify some code style.