Add OAuth2 token management and storage implementation #448

Job	Run time
SonarQube	25s
lint	21s
Service Availability Check	2m 8s
Dockerfile Linting	9s
Docker Security Scanning (n8n, Dockerfile.n8n, n8n-test:latest)	2m 27s
Docker Security Scanning (temporal, Dockerfile.temporal, temporal-test:latest)	1m 2s
	6m 32s

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