fix: Remove OpenAI dependency for memory reset when using alternative LLMs

- Add environment variables for default embedding provider
- Support Ollama as default embedding provider
- Add tests for memory reset with different providers
- Update documentation

Fixes #2023

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/memory/test_memory_reset.py

@@ -48,6 +48,19 @@ def test_memory_reset_with_invalid_provider(temp_db_dir):
         for memory in memories:
             memory.reset()
 
+def test_memory_reset_with_invalid_configuration(temp_db_dir):
+    os.environ["CREWAI_EMBEDDING_PROVIDER"] = "openai"
+    os.environ.pop("OPENAI_API_KEY", None)
+    
+    with pytest.raises(EmbeddingConfigurationError):
+        memories = [
+            ShortTermMemory(path=temp_db_dir),
+            LongTermMemory(path=temp_db_dir),
+            EntityMemory(path=temp_db_dir)
+        ]
+        for memory in memories:
+            memory.reset()
+
 def test_memory_reset_with_missing_ollama_url(temp_db_dir):
     os.environ["CREWAI_EMBEDDING_PROVIDER"] = "ollama"
     os.environ.pop("CREWAI_OLLAMA_URL", None)
@@ -59,3 +72,20 @@ def test_memory_reset_with_missing_ollama_url(temp_db_dir):
     ]
     for memory in memories:
         memory.reset()
+
+def test_memory_reset_with_custom_path(temp_db_dir):
+    os.environ["CREWAI_EMBEDDING_PROVIDER"] = "ollama"
+    custom_path = os.path.join(temp_db_dir, "custom")
+    os.makedirs(custom_path, exist_ok=True)
+    
+    memories = [
+        ShortTermMemory(path=custom_path),
+        LongTermMemory(path=custom_path),
+        EntityMemory(path=custom_path)
+    ]
+    for memory in memories:
+        memory.reset()
+        
+    assert not os.path.exists(os.path.join(custom_path, "short_term"))
+    assert not os.path.exists(os.path.join(custom_path, "long_term"))
+    assert not os.path.exists(os.path.join(custom_path, "entity"))