Can we add a way to estimate token size for Ollama?

[shhlife]

• [x ] I have read and agree to the contributing guidelines.

Currently we have a TokenCounter utility that will count tokens for drivers other than Ollama. Ollama currently doesn't provide token information in it's responses: ollama/ollama#1716, but we could perhaps use a tokenizer to estimate token size?

This might be useful as well for customers to estimate a call before they run it.