fix: move debug to dependencies, add vite peer dependency

[lukashass]

Here is another fix for using @intlify/vite-plugin-vue-i18n with yarn 2.

When starting vite I get:

Error: @intlify/vite-plugin-vue-i18n tried to access debug, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.

Required package: debug (via "debug")
Required by: @intlify/vite-plugin-vue-i18n@npm:2.0.2 (via ./.yarn/cache/@intlify-vite-plugin-vue-i18n-npm-2.0.2-157305a34b-3e7108929e.zip/node_modules/@intlify/vite-plugin-vue-i18n/lib/)

and

Error: @intlify/vite-plugin-vue-i18n tried to access vite, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.

Required package: vite (via "vite")
Required by: @intlify/vite-plugin-vue-i18n@npm:2.0.2 (via ./.yarn/cache/@intlify-vite-plugin-vue-i18n-npm-2.0.2-157305a34b-3e7108929e.zip/node_modules/@intlify/vite-plugin-vue-i18n/lib/)

I moved debug to dependencies and listed vite as peerDependency as per the yarn rulebook.

I just copied the vite version from devDependencies, although I'm pretty sure it works with lower versions, too (I'm still using vite@2.0.0-beta.55 and it seems to work just fine).
My understanding is that it is best to define the lowest supported version as peerDependency, but I don't know which one that actually is.

[kazupon]

Thanks!