Rule suggestion: `vue/no-prop-default-true`

[FloEdelmann]

Please describe what the rule should do:
For prop definitions, the rule reports default: true.
Boolean props with default: false can use the shorthand syntax (see #775, #1781, #1796, #1797).

What category should the rule belong to?
[ ] Enforces code style (layout)
[ ] Warns about a potential error (problem)
[x] Suggests an alternate way of doing something (suggestion)
[ ] Other (please specify:)

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

export default {
  props: {
    // PASS
    foo: Boolean,
    foo: String,
    foo: { type: Boolean },
    foo: { type: String },
    foo: { type: [Boolean, String] },
    foo: { type: Boolean, default: false },
    foo: { type: String, default: false },
    foo: { type: [Boolean, String], default: false },

    // FAIL
    foo: { type: Boolean, default: true },
    foo: { type: String, default: true },
    foo: { type: [Boolean, String], default: true },
  },
}

[FloEdelmann]

@g-plane Would you maybe be interested in implementing this rule? (No problem if you are not 🙂)

[FloEdelmann]

Oh sorry, this rule does already exist!

See https://eslint.vuejs.org/rules/no-boolean-default.html