feat: add agent stats for different connection types (#6412)

This allows us to track when our extensions are used, when the
web terminal is used, and average connection latency to the agent.

coderd/database/queries/workspaceagentstats.sql

@@ -12,10 +12,15 @@ INSERT INTO
 		rx_packets,
 		rx_bytes,
 		tx_packets,
-		tx_bytes
+		tx_bytes,
+		session_count_vscode,
+		session_count_jetbrains,
+		session_count_reconnecting_pty,
+		session_count_ssh,
+		connection_median_latency_ms
 	)
 VALUES
-	($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) RETURNING *;
+	($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17) RETURNING *;
 
 -- name: GetTemplateDAUs :many
 SELECT