Add Snowflake integration docs (wip)

docs/snowflake.md

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+# Snowflake ❄️ 🏗️
+
+Snowflake is a cloud-based data warehousing platform that enables users to store, manage, and analyze large volumes of data. It provides a scalable and flexible architecture that separates storage and compute resources, allowing for efficient data processing and querying.
+
+## Step 1: Create an OAuth Integration in Snowflake
+
+To enable OAuth for your Snowflake account, an administrator must first register the connected app.
+
+```python exec
+import reflex as rx
+from flexgen.integrations.snowflake import SnowflakeAuthState
+from flexgen.ui.components.markdown import get_base_component_map
+```
+
+```python eval
+# Actually render the real redirect_uri for copy/paste
+get_base_component_map()["codeblock"](
+    f"""CREATE SECURITY INTEGRATION oauth_reflex_build_int
+  TYPE = OAUTH
+  ENABLED = TRUE
+  OAUTH_CLIENT = CUSTOM
+  OAUTH_CLIENT_TYPE = 'PUBLIC'
+  OAUTH_REDIRECT_URI = '{SnowflakeAuthState.redirect_uri}'
+  OAUTH_ISSUE_REFRESH_TOKENS = TRUE
+  OAUTH_REFRESH_TOKEN_VALIDITY = 86400;""",
+    language="sql",
+)
+```
+
+## Step 2: Log in via OAuth
+
+NOTE: you must use a non-admin account to complete the OAuth flow.
+
+## Work in Progress
+
+Currently this integration does not support external OAuth flows, key pair
+authentication, or external network access.