Do not register socket-binding bound attributes as metrics

Socket-binding resource registers 3 attributes as metric:

• bound
• bound-port
• bound-address

None of these attributes are actual metric (that may change due to server activity).
They should be registered as runtime read-only attributes instead.

This change only impacts metadata and does not require resource transformation.

Additionally, I've checked with HAL team that this change has no impact on HAL UI (that does not distinguish between read-only runtime attribute and metric).