5.3.2
refact(data): separate List to DataStorage and SeriesData
fix(sankey): return cached value
fix(bar): fix stacked large bar
refact: put all core modules in the core dir. only do export in lib/echarts
style: using utility methods for type checking.
style: optimize symbol visual code
ts: let to const. And add eslint rule "prefer-const".
fix: other rename of data storage -> data store