feat: dashboard supports selecting: Service Discovery when creating an upstream

[tzssangglass]

Feature request

Support the configuration of discovery_type and service_name.

related issue

• Dashboard support the use of Nacos storage APISIX configuration? #1911
• feat: support discovery_type in Dashboard #1549

[juzhiyuan]

Just updated your first comment, and I will take this.

[liuxiran]

#1557

BE has already support this feature, remove backend tag

[liuxiran]

Refer to the https://apisix.apache.org/docs/apisix/2.7/discovery#supported-discovery-registries

In APISIX2.7 , we support Eureka/Consul/Nacos and service discovery via DNS,

in order to support this feature in dashboard, we have to update our Upstream module, add Target type filed, user can choose Node or Service Discovery

when choose Node, user can complete the follow fields:

When choose Service Discovery, user can complete the following fields:
discovery_type, a list of dns、consul_kv nacos and eureka
service_name , input the your configured service name

It should be noted that, when discovery_type choose nacos, discovery_args can be configured, see: https://apisix.apache.org/docs/apisix/2.7/discovery/nacos#discovery_args for details.

cc @bzp2010 @juzhiyuan @Baoyuantop @tzssangglass @nic-chen @spacewander to help to check whether I missed some thing for this feature, thanks a lot.

[spacewander]

LGTM

[juzhiyuan]

LGTM

[nic-chen]

LGTM

[Baoyuantop]

LGTM

[bzp2010]

This issue is similar to issue #1989, and I will try it.