feat: restructure as monorepo

- Move core CrewAI to packages/crewai with git mv to preserve history
- Create workspace-level pyproject.toml with uv workspace configuration
- Rename core package to crewai-core
- Setup workspace sources for internal package dependencies

packages/crewai/tests/config/tasks.yaml

@@ -0,0 +1,18 @@
+research_task:
+  description: >
+    Conduct a thorough research about {topic}
+    Make sure you find any interesting and relevant information given
+    the current year is 2025.
+  expected_output: >
+    A list with 10 bullet points of the most relevant information about {topic}
+  agent: researcher
+  guardrail: ensure each bullet contains its source
+
+reporting_task:
+  description: >
+    Review the context you got and expand each topic into a full section for a report.
+    Make sure the report is detailed and contains any and all relevant information.
+  expected_output: >
+    A fully fledge reports with the mains topics, each with a full section of information.
+    Formatted as markdown without '```'
+  agent: reporting_analyst