feat: add /health-check route

URL : /health-check

# Database status
####################################################################################
#     HTTP Code   HTML page contains          HTTP header [ X-Tajine-Database-Status ]
#     200|503     DB_CONNECTION_SUCCESSFUL    DB_CONNECTION_SUCCESSFUL
#     503         DB_CONNECTION_FAILED        DB_CONNECTION_FAILED

# CFSSL status
####################################################################################
#     HTTP Code   HTML page contains           HTTP header [ X-Tajine-Cfssl-Status ]
#     200|503     CFSSL_CONNECTION_SUCCESSFUL  CFSSL_CONNECTION_SUCCESSFUL
#     503         CFSSL_CONNECTION_FAILED      CFSSL_CONNECTION_FAILED

curl --head http://127.0.0.1:8001/health-check
    # HTTP/1.1 200 OK
    # Content-Type: text/html; charset=UTF-8
    # X-Tajine-Database-Status: DB_CONNECTION_SUCCESSFUL
    # X-Tajine-Cfssl-Status:    CFSSL_CONNECTION_SUCCESSFUL

curl --head http://127.0.0.1:8001/health-check
    # HTTP/1.1 503 Service Unavailable
    # Content-Type: text/html; charset=UTF-8
    # X-Tajine-Database-Status: DB_CONNECTION_FAILED
    # X-Tajine-Cfssl-Status:    CFSSL_CONNECTION_SUCCESSFUL

curl --head http://127.0.0.1:8001/health-check
    # HTTP/1.1 503 Service Unavailable
    # Content-Type: text/html; charset=UTF-8
    # X-Tajine-Database-Status: DB_CONNECTION_SUCCESSFUL
    # X-Tajine-Cfssl-Status:    CFSSL_CONNECTION_FAILED

curl --head http://127.0.0.1:8001/health-check
    # HTTP/1.1 503 Service Unavailable
    # Content-Type: text/html; charset=UTF-8
    # X-Tajine-Database-Status: DB_CONNECTION_FAILED
    # X-Tajine-Cfssl-Status:    CFSSL_CONNECTION_FAILED