Support loose attribute value

[mantou132]

e.g:

<div attr=${true}></div>
<div attr=${true} attr=${''}></div>
<dy-modal adf=adf" 123>123</dy-modal>

[amaanq]

please undo the formatting changes, just commit the relevant hunks for the PR.

[mantou132]

Is tree-sitter generate unnecessary?