Revisit the user experience for api layer for mgmt plane

[qiaozha]

As mgmt plane often has operationId GroupName_OperationName format, operation name conflicts are quite common, which cause us getting operationName like firewallRulesGet in the api layer.
we could enable hierarchyClient: true to get a subpath for each operation group like /api/firewallRules and no need to change the operation name, But it would be unrealistic to do so as mgmt plane has a lot of operation groups.

[qiaozha]

prefer to keep it as is for mgmt plane.

[qiaozha]

we will have to enable hierarchyClient: true for mgmt plane.