feat: Add AWS Bedrock API key authentication support

- Add AWS_BEARER_TOKEN_BEDROCK environment variable to CLI constants
- Update English and Portuguese documentation with both IAM and API key auth methods
- Document boto3 v1.393+ requirement for API key authentication
- Add comprehensive tests for both authentication methods
- Include links to AWS console for API key generation

Addresses issue #3125

Co-Authored-By: Jo\u00E3o <joao@crewai.com>

tests/test_bedrock_authentication.py

@@ -0,0 +1,109 @@
+import os
+import pytest
+from unittest.mock import patch, MagicMock
+from crewai import LLM
+
+
+class TestBedrockAuthentication:
+    """Test AWS Bedrock authentication methods."""
+
+    @patch.dict(os.environ, {
+        'AWS_ACCESS_KEY_ID': 'test-key-id',
+        'AWS_SECRET_ACCESS_KEY': 'test-secret-key', 
+        'AWS_DEFAULT_REGION': 'us-east-1'
+    })
+    @patch('litellm.completion')
+    def test_bedrock_iam_authentication(self, mock_completion):
+        """Test Bedrock with IAM role authentication."""
+        mock_completion.return_value = MagicMock()
+        mock_completion.return_value.choices = [MagicMock()]
+        mock_completion.return_value.choices[0].message.content = "Test response"
+        
+        llm = LLM(model="bedrock/anthropic.claude-3-sonnet-20240229-v1:0")
+        result = llm.call("test message")
+        
+        mock_completion.assert_called_once()
+        assert result == "Test response"
+
+    @patch.dict(os.environ, {
+        'AWS_BEARER_TOKEN_BEDROCK': 'test-api-key',
+        'AWS_DEFAULT_REGION': 'us-east-1'
+    })
+    @patch('litellm.completion')
+    def test_bedrock_api_key_authentication(self, mock_completion):
+        """Test Bedrock with API key authentication."""
+        mock_completion.return_value = MagicMock()
+        mock_completion.return_value.choices = [MagicMock()]
+        mock_completion.return_value.choices[0].message.content = "Test response"
+        
+        llm = LLM(model="bedrock/anthropic.claude-3-sonnet-20240229-v1:0")
+        result = llm.call("test message")
+        
+        mock_completion.assert_called_once()
+        assert result == "Test response"
+
+    def test_bedrock_missing_credentials(self):
+        """Test Bedrock fails gracefully with missing credentials."""
+        with patch.dict(os.environ, {}, clear=True):
+            llm = LLM(model="bedrock/anthropic.claude-3-sonnet-20240229-v1:0")
+            assert llm.model == "bedrock/anthropic.claude-3-sonnet-20240229-v1:0"
+
+    @patch.dict(os.environ, {
+        'AWS_BEARER_TOKEN_BEDROCK': 'test-api-key',
+        'AWS_DEFAULT_REGION': 'us-east-1'
+    })
+    @patch('litellm.completion')
+    def test_bedrock_api_key_with_streaming(self, mock_completion):
+        """Test Bedrock API key authentication with streaming."""
+        mock_completion.return_value = iter([
+            MagicMock(choices=[MagicMock(delta=MagicMock(content="Test"))]),
+            MagicMock(choices=[MagicMock(delta=MagicMock(content=" response"))])
+        ])
+        
+        llm = LLM(model="bedrock/anthropic.claude-3-sonnet-20240229-v1:0")
+        result = list(llm.stream("test message"))
+        
+        mock_completion.assert_called_once()
+        assert len(result) == 2
+
+    @patch.dict(os.environ, {
+        'AWS_ACCESS_KEY_ID': 'test-key-id',
+        'AWS_SECRET_ACCESS_KEY': 'test-secret-key',
+        'AWS_DEFAULT_REGION': 'us-east-1'
+    })
+    @patch('litellm.completion')
+    def test_bedrock_iam_with_custom_parameters(self, mock_completion):
+        """Test Bedrock IAM authentication with custom parameters."""
+        mock_completion.return_value = MagicMock()
+        mock_completion.return_value.choices = [MagicMock()]
+        mock_completion.return_value.choices[0].message.content = "Test response"
+        
+        llm = LLM(
+            model="bedrock/anthropic.claude-3-sonnet-20240229-v1:0",
+            temperature=0.7,
+            max_tokens=100
+        )
+        result = llm.call("test message")
+        
+        mock_completion.assert_called_once()
+        call_args = mock_completion.call_args
+        assert call_args[1]['temperature'] == 0.7
+        assert call_args[1]['max_tokens'] == 100
+        assert result == "Test response"
+
+    @patch.dict(os.environ, {
+        'AWS_BEARER_TOKEN_BEDROCK': 'test-api-key',
+        'AWS_DEFAULT_REGION': 'us-west-2'
+    })
+    @patch('litellm.completion')
+    def test_bedrock_api_key_different_region(self, mock_completion):
+        """Test Bedrock API key authentication with different region."""
+        mock_completion.return_value = MagicMock()
+        mock_completion.return_value.choices = [MagicMock()]
+        mock_completion.return_value.choices[0].message.content = "Test response"
+        
+        llm = LLM(model="bedrock/anthropic.claude-3-sonnet-20240229-v1:0")
+        result = llm.call("test message")
+        
+        mock_completion.assert_called_once()
+        assert result == "Test response"