feat: A method to opt-out of automatic use of useMeta

[gapipro]

🆒 Your use case
Currently if you are using existing setup for meta: {}, adding composition-api automatically changes the behaviour to useMeta way.

This breaks existing code what uses object instead of function at nuxt.app.head.

What is even more strange is that initial render still has old setup, but after page is rendered it switches to useMeta way.

🆕 The solution you'd like
Add an option to module to disable this automatic behaviour.

[rchl]

Are you thinking globally opt out or per page component?