Implementation of jpa saving for traffic traces.

backend/codiki-infrastructure/src/main/resources/sql/002-traffic-trace-table.sql

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+CREATE TABLE IF NOT EXISTS traffic (
+    id UUID NOT NULL,
+    date_time TIMESTAMP WITH TIME ZONE NOT NULL,
+    endpoint_method SMALLINT NOT NULL,
+    endpoint_path VARCHAR NOT NULL,
+    user_id UUID,
+    correlation_id VARCHAR,
+    CONSTRAINT traffic_pk PRIMARY KEY (id),
+    CONSTRAINT traffic_user_id_fk FOREIGN KEY (user_id) REFERENCES "user" (id)
+);
+CREATE INDEX traffic_user_id_idx ON traffic (user_id);