chore: add deprecated a2a auth compatibility shims

lib/crewai/src/crewai/a2a/auth/schemas.py

@@ -0,0 +1,71 @@
+"""Deprecated: Authentication schemes for A2A protocol agents.
+
+This module is deprecated. Import from crewai.a2a.auth instead:
+- crewai.a2a.auth.ClientAuthScheme (replaces AuthScheme)
+- crewai.a2a.auth.BearerTokenAuth
+- crewai.a2a.auth.HTTPBasicAuth
+- crewai.a2a.auth.HTTPDigestAuth
+- crewai.a2a.auth.APIKeyAuth
+- crewai.a2a.auth.OAuth2ClientCredentials
+- crewai.a2a.auth.OAuth2AuthorizationCode
+"""
+
+from __future__ import annotations
+
+from typing_extensions import deprecated
+
+from crewai.a2a.auth.client_schemes import (
+    APIKeyAuth as _APIKeyAuth,
+    BearerTokenAuth as _BearerTokenAuth,
+    ClientAuthScheme as _ClientAuthScheme,
+    HTTPBasicAuth as _HTTPBasicAuth,
+    HTTPDigestAuth as _HTTPDigestAuth,
+    OAuth2AuthorizationCode as _OAuth2AuthorizationCode,
+    OAuth2ClientCredentials as _OAuth2ClientCredentials,
+)
+
+
+@deprecated("Use ClientAuthScheme from crewai.a2a.auth instead", category=FutureWarning)
+class AuthScheme(_ClientAuthScheme):
+    """Deprecated: Use ClientAuthScheme from crewai.a2a.auth instead."""
+
+
+@deprecated("Import from crewai.a2a.auth instead", category=FutureWarning)
+class BearerTokenAuth(_BearerTokenAuth):
+    """Deprecated: Import from crewai.a2a.auth instead."""
+
+
+@deprecated("Import from crewai.a2a.auth instead", category=FutureWarning)
+class HTTPBasicAuth(_HTTPBasicAuth):
+    """Deprecated: Import from crewai.a2a.auth instead."""
+
+
+@deprecated("Import from crewai.a2a.auth instead", category=FutureWarning)
+class HTTPDigestAuth(_HTTPDigestAuth):
+    """Deprecated: Import from crewai.a2a.auth instead."""
+
+
+@deprecated("Import from crewai.a2a.auth instead", category=FutureWarning)
+class APIKeyAuth(_APIKeyAuth):
+    """Deprecated: Import from crewai.a2a.auth instead."""
+
+
+@deprecated("Import from crewai.a2a.auth instead", category=FutureWarning)
+class OAuth2ClientCredentials(_OAuth2ClientCredentials):
+    """Deprecated: Import from crewai.a2a.auth instead."""
+
+
+@deprecated("Import from crewai.a2a.auth instead", category=FutureWarning)
+class OAuth2AuthorizationCode(_OAuth2AuthorizationCode):
+    """Deprecated: Import from crewai.a2a.auth instead."""
+
+
+__all__ = [
+    "APIKeyAuth",
+    "AuthScheme",
+    "BearerTokenAuth",
+    "HTTPBasicAuth",
+    "HTTPDigestAuth",
+    "OAuth2AuthorizationCode",
+    "OAuth2ClientCredentials",
+]