feat: add thread-safe platform context management (#3502)

Co-authored-by: Greyson LaLonde <greyson.r.lalonde@gmail.com>

src/crewai/context.py

@@ -0,0 +1,25 @@
+import os
+import contextvars
+from typing import Optional
+from contextlib import contextmanager
+
+_platform_integration_token: contextvars.ContextVar[Optional[str]] = contextvars.ContextVar(
+    "platform_integration_token", default=None
+)
+
+def set_platform_integration_token(integration_token: str) -> None:
+    _platform_integration_token.set(integration_token)
+
+def get_platform_integration_token() -> Optional[str]:
+    token = _platform_integration_token.get()
+    if token is None:
+        token = os.getenv("CREWAI_PLATFORM_INTEGRATION_TOKEN")
+    return token
+
+@contextmanager
+def platform_context(integration_token: str):
+    token = _platform_integration_token.set(integration_token)
+    try:
+        yield
+    finally:
+        _platform_integration_token.reset(token)