DSN connection string support, configure via Config (instead of env vars)

[dkarlovi]

• Symfony version: 5.4
• Algolia Search Bundle version: 6.0
• Algolia Client Version: 3.3.0
• Language Version: 8.0

Description

Currently, the client definition looks like this

        <service id="search.client" class="Algolia\AlgoliaSearch\SearchClient" public="true" lazy="true">
            <factory class="Algolia\AlgoliaSearch\SearchClient" method="create" />
            <argument key="$appId">%env(ALGOLIA_APP_ID)%</argument>
            <argument key="$apiKey">%env(ALGOLIA_API_KEY)%</argument>
        </service>

This is not how Symfony bundles typically do this because it creates a hard requirement the credentials need to be in env vars, which is not what what you want to do.

A better approach is to use the bundle's config, like so

algolia_search:
   id: 123
   key: s3cr3t

This allows the developer to still use env:

algolia_search:
   id: %env(ALGOLIA_APP_ID)%
   key: %env(ALGOLIA_API_KEY)%

but they can choose other ways to do it to, like Symfony secrets.

Extending this idea, a further optimization would be to bundle the ID/key in one param, a sort of a DSN like Doctrine and other Symfony components use. This allows storing the entire thing as a secret and keeping it all together.