Feature request for a `TokenCountEstimator` for Bedrock. It would be great to have `BedrockTokenCountEstimator` that uses the CountTokens API provided by Bedrock.
**Is your feature request related to a problem? Please describe.** Feature request for a `TokenCountEstimator` for Bedrock. **Describe the solution you'd like** Bedrock has a [CountTokens API](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_CountTokens.html) and it'd be great to have `BedrockTokenCountEstimator` that uses it. **Describe alternatives you've considered** My alternatives at the moment is to use openAI estimator with a ratio depending on model and benchmarks I found. Another thing I was exploring wad to leverage TokenUsage from bedrock to estimate token usage but this is tedious and unreliable. Token usage are provided in responses. **Additional context** <!-- Add any other context or screenshots about the feature request here. -->