feat: Enable usage token and use Converse API with all Bedrock models

[charles-marion]

Issue #, if available:
Follow up of #564

Description of changes:
Since the bedrock converse api allows a team to "write code once and use it with different models.", this change aims to use the same code for all Bedrock models.

The only differences are some models do not support system prompt or streaming.

The main goal of this change is to add usage token tracking to all Bedrock models.

Changes

• Remove model specific code for Bedrock
• Add unit test for the bedrock adapters
• Add an user friendly message is a bedrock model is not enabled
• Add unit test

Notes

• the main changes are in lib/model-interfaces/langchain/functions/request-handler/adapters/bedrock/base.py. Github hides this file by default
• since all the models use the same prompts. LLama custom prompts are no longer used and it relies on the Converse API.

Testing
Called the models one by and checked the usage

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