Expand the traffic-split plug-in

[lordcheng10]

Description

Expand the traffic-split plug-in to solve the following scenarios:

1. Service A is deployed in two regions, and the region-aware configuration of Eureka is enabled;
2. Use the traffic-split plug-in to split the traffic of the service in different regions;

configuration modification

eureka-fileter: host: - https://xxx prefix: /eureka/ fetch_interval: 15 weight: 100 timeout: connect: 2000 send: 2000 read: 5000

Use the command as follows:

`
curl http://127.0.0.1:9180/apisix/admin/upstreams/zone1_provider -H "X-API-KEY: dd" -X PUT -d '{
"type": "roundrobin",
"name": "gcp_provider",
"discovery_type": "eureka-filter",
"service_name": "SERVICE-PROVIDER",
"discovery_args": {
"zone": "zone1"
}
}'

curl -i http://127.0.0.1:9180/apisix/admin/upstreams/zone2_provider -H "X-API-KEY: dd" -X PUT -d '{
"type": "roundrobin",
"name": "aws_provider",
"discovery_type": "eureka-filter",
"service_name": "SERVICE-PROVIDER",
"discovery_args": {
"zone": "zone2"
}
}'

curl -i http://127.0.0.1:9180/apisix/admin/routes/zone_traffic_split_test -H "X-API-KEY: dd" -X PUT -d '
{
"uri": "/hello",
"plugins": {
"traffic-split": {
"rules": [
{
"weighted_upstreams": [
{
"upstream_id": "zone1_provider",
"weight": 90
},
{
"upstream_id": "zone2_provider",
"weight": 10
}
]
}
]
}
}
}'
`

[lordcheng10]

@membphis @nic-6443 @nic-chen PTL,thanks!

[shreemaan-abhishek]

two things:

• advisable to discuss the proposal first with the community
• need to add docs and test cases after ⬆️

[Baoyuantop]

I'll convert this PR to draft first, if the changes are done please request review again.

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