bug: 2.1 version create route with jwt-auth will display an error

[idbeta]

Bug report

Describe the bug

2.1 version create route with jwt-auth will display an error
btw, create with key-auth or basic-auth also has the problem

Request URL: http://127.0.0.1:8080/apisix/admin/routes
Request Method: POST
{"name":"test","desc":"","uris":["/hello"],"methods":["GET","HEAD","POST","PUT","DELETE","OPTIONS","PATCH"],"plugins":{"jwt-auth":{}},"vars":[],"upstream":{"type":"roundrobin","timeout":{"connect":6000,"send":6000,"read":6000},"nodes":[{"host":"127.0.0.1","port":7000,"weight":1}]}}

Response
{"code":10000,"message":"scheme validate failed: properties must be of type object","data":null,"request_id":"fa40087e-bfbf-45a3-a216-2f93e0683c9a"}

[liuxiran]

The issue caused by this hack:

apisix-dashboard/api/internal/core/store/validate.go

Line 243 in 1a38fa6

reg := regexp.MustCompile(`\"properties\":\[\]`)

as the schema.json do the format, "properties":[] changed to "properties": []

apisix-dashboard/api/conf/schema.json

Line 1430 in 1a38fa6

"properties": [],

---

The simple and rough way is to modify the regular expression to

reg := regexp.MustCompile(`\"properties\": \[\]`) 

best way is refer to @membphis 's suggestion: #651 (comment), and need @nic-chen 's help

[nic-chen]

@liuxiran thanks for your remind.

[nic-chen]

fixed by json schema updated.

and here is a test case for it:
https://github.com/apache/apisix-dashboard/blob/master/api/test/e2e/route_with_auth_plugin_test.go#L38-L58