fix(use-v-on-exact): Reimplement algorithm to catch cases more properly

[michalsnik]

Fixes #727

I changed a bit how the rule works and now I'm reporting events only if one of the key modifiers have been used. That prevents reports about cases like @mouseenter="foo" @mouseenter.once="bar".

I also compare all system modifiers chains for given event, and report cases, that have previously been omitted, like:

<button @click.ctrl="foo" @click.ctrl.shift="bar"/>

Additionally I distinct native elements from components, and for components I only compare events that have native modifier. So we'll no longer report this as an error:

<UiButton @click="foo" @click.native="bar"/>

If you have any additional case that come to your mind, please share them.

[michalsnik]

@posva I updated the rule in the last commit, to only consider usage of exact for cases where system modifiers have been used, not keys.

[mysticatea]

LGTM, thank you!

[posva]

I'm not relevant to review the rest but I'm glad I could help!