improve the warning in `inject`

[gurgeous]

I believe it's coming from this line:

vue/src/v3/apiInject.ts

Line 69 in 9e88707

warn(`inject() can only be used inside setup() or functional components.`)

I started seeing a lot of this warning after a recent upgrade. I thought it was my code but turned out to be Nuxt UI. Including the key in the warning would be helpful.

[Tia-ani]

Hi @gurgeous , i would like to work on this issue cauld u assign it to me?