Add mirostat_eta and mirostat_tau model parameters supported by Ollama / llama.cpp backend

[sealad886]

Description

Added new variables to relevant parts of the code to enable:

• mirostatEta and mirostatTau can be configured in the appropriate spot in config.json
• These variables are now sent to the _streamComplete and _streamChat functions (and any other data structure that extends BaseCompletionOptions and related accessor functions)
• updated documentation

Fixes #3345

Checklist

• The relevant docs, if any, have been updated or created

Screenshots

The schema options are validated and suggested appropriately:

Testing

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