fix: merge consecutive toolResult blocks into single user message

[Wendong-Fan]

from #3956

Fixes #3954

AWS Bedrock Converse API requires that all toolResult blocks corresponding to a multi-tool-use assistant turn are grouped in a single immediately-following user message. The current code creates a separate user message per tool result, which causes:

botocore.errorfactory.ValidationException: An error occurred (ValidationException)
when calling the Converse operation: Expected toolResult blocks at messages.2.content
for the following Ids: tooluse_bRX9ftpYK3xO5tev2x4qtc

also release 0.2.90

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