feat: reactive availableLocales using computed property

[mnenie]

resolves #1893

so, I had the same problem and as a solution I implemented the idea suggested by the man who created the issue using computed in availableLocales at composer.ts
also I wrote some tests and change some things in legacy.ts to accommodate this of course
now its works great :)

[kazupon]

It is necessary to test with watch / watchEffect to see if the reaction is taking place.

[kazupon]

Thank you for your contributing!
I've just reviewed your PR!
Please, let's check it out :)

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commit: 6c8fced

[mnenie]

Thank you for your contributing! I've just reviewed your PR! Please, let's check it out :)

hi @kazupon !
so, I made it
I hope that's what you asked for 💯 :)

i made the new test for checking how it work with watchEffect

all tests passed

[BobbieGoede]

Just checking, this would be a breaking change right?

[mnenie]

Just checking, this would be a breaking change right?

maybe yea
so, now we have a reactive scenario with availableLocales and the type of usage will change to .value in setup

[kazupon]

@BobbieGoede

Just checking, this would be a breaking change right?

Thank you for making me realize!
Yeah, This PR has breaking changes.
So, I've made v11 branch.
https://github.com/intlify/vue-i18n/tree/v11

v11 branch will be included bug fixes and backward-compatible features until vue-i18n v12
master branch is v12 develop branch.