community: Instantiate GPT4AllEmbeddings with parameters (#21238)
### GPT4AllEmbeddings parameters
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**Description:**
As of right now the **Embed4All** class inside _GPT4AllEmbeddings_ is
instantiated as it's default which leaves no room to customize the
chosen model and it's behavior. Thus:
- GPT4AllEmbeddings can now be instantiated with custom parameters like
a different model that shall be used.
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Co-authored-by: AlexJauchWalser <alexander.jauch-walser@knime.com>