Rule proposal: disallow string literal in mustache

[golopot]

Please describe what the rule should do:
Disallow string literals in mustache.

What category should the rule belong to?

[x] Enforces code style

Provide 2-3 code examples that this rule should warn about:

<div>{{"foo"}}</div>
<div :class="{{'baz'}}" />

Additional context
Similar rule in eslint-plugin-react: react/jsx-curly-presense.