[BC] rename composables names to use 'Algolia'

[Baroshem]

As proposed by Daniel and Pooya, it would be beneficial to include 'Algolia' in the naming of the composables (as they are auto imported) to avoid conflicts.

It was already introduced in version 0.8.3 with a new composable called 'useAlgoliaRecommend'. The next step now is to rename other composables to avoid future conflicts.

I propose following names:

1. useAlgolia -> useAlgoliaRef

2. useSearch -> useAlgoliaSearch

3. useSearchForFacetValues -> useAlgoliaFacetedSearch

4. useInitIndex -> useAlgoliaInitIndex

5. useAlgoliaRecommend -> already live.

In order to avoid unnecessary issues in production for users, I would like to create a two step process of implementing that:

1. Duplicate current composables but with the names changed to the ones proposed in the previous section and add a console.warn for current composables that they will be deprecated with the next major version in favor of the new named components. Modify the readme warning from the current one that is already outdated to inform the users that there are plans to rename composables to better fit the nuxt 3 auto import approach.
2. In the next major version remove the old composables and just leave the new ones.