feat: implementing v-html transform

[pikax]

v-html implementation

this is based on the current v-html implementation in v2

// template
<div v-html="testState"/>
// generated
export default function render() {
  const _ctx = this
  return (openBlock(), createBlock("div", { innerHTML: _ctx.testState }, null, 8 /* PROPS */, ["innerHTML"]))
}

// template
<div v-html="testState">Hello World!<p>test</p></div>
// generated
export default function render() {
  const _ctx = this
  return (openBlock(), createBlock("div", { innerHTML: _ctx.testState }, null, 8 /* PROPS */, ["innerHTML"]))
}

Advice and recommendations are welcome

[znck]

Some of my comments on #130 apply here too.

[znck]

Suggested change

	// v-show can't be used outside of an element
	// v-html can't be used outside of an element

[yyx990803]

v-html (and v-text) shouldn't be structural directive transforms (The only structural directives are v-if and v-for). They should just be normal transforms mapping the directive to the corresponding prop.

[yyx990803]

Really appreciate the PR but by directiveTransform I actually meant something like this: eadcaea#diff-939380a39655d7195a8a1c71675c6f8a

I noticed that previously directiveTransforms do not have access to the elementNode so I had to update its signature. Would you mind updating the v-text PR to mirror my commit? Thanks!