New: Add vue/require-v-if-inside-transition rule

[ota-meshi]

This PR adds the vue/require-v-if-inside-transition rule.

This rule reports elements inside <transition> that do not control the display.

ref #1035

[sodatea]

Hmmm, now I feel a little bit regretful on the rule naming…
Now that v-show is also allowed, is require-v-if- the right name for it?

[ota-meshi]

Hi @sodatea.

I also considered the name, but v-if is a very short name and it is easy to understand the meaning of "control the presence of the content". I couldn't think of a better name than this.
Do you have any good name ideas?

[sodatea]

What about require-toggle-inside-transition? I'm really bad at naming things 😂

[ota-meshi]

I think that's good naming! I like that name! I would like to change the rule name in the next release.
Thank you:smile: