* feat(textarea-item): add delete icon
* feat(test): update textarea-item test
* test(textarea-item): add textarea-item unit test
* doc(textarea-item): add clearable doc
* doc(textarea-item): mark the avaiable version for clearable
feat(textarea): reorder following vue-style-guide
feat(textarea): add event capture
doc(textarea): add doc
feat(textarea): remove unuse code
feat(textarea-item): rename textarea => textarea-item
test(textarea-item): add test
test(textarea-input): add test
fix(textarea-item): autosize alone does't work
fix(textarea-item): add style: 'resize: none'
test(textarea-item): specific the purpose of this test
fix(textarea-item): remove unused event
test(textarea-item): update test style
test(textarea-item): update snapshots
feat(textarea-item): use $ref rather then $el.querySelector
test(textarea-item): update snapshots