Add support for new `generative-digitalocean` module

[antas-marcin]

This is a new module that will come out with latest v1.37+ Weaviate versions:

Here are the links to proto messages:

GenerativeDigitalOcean
GenerativeDigitalOceanMetadata

Available settings are:
baseURL - string (defaults to: https://inference.do-ai.run)
model - string (defaults to: llama-4-maverick)
temperature - *float64
topP - *float64
maxTokens - *int
frequencyPenalty - *float64
presencePenalty - *float64
stop - []string