Hope to support simplified API (json) login mode

Comment From: eleftherias

@120011676 Could you explain in more detail what you mean by a simplified API?

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Comment From: 120011676

now default: http request body: username=admin&password=123456

simplified config support(application.yml config a value): http request body: { "username":"admin", "password":"123456", }

and rememberMe

@eleftherias @spring-issuemaster
It is more convenient to develop a pageless HTTP interface