[yang] Need Yang for RESTAPI table

[ganglyu]

Description

We don't have Yang model for RESTAPI table.

Steps to reproduce the issue:

1. Run 'config apply-patch' command
2. We can get below info:
   sonic_yang(6):Note: Below table(s) have no YANG models: CONSOLE_SWITCH, DEVICE_NEIGHBOR_METADATA, DHCP_SERVER, KDUMP, RESTAPI, SNMP, SNMP_COMMUNITY, TELEMETRY

Describe the results you received:

sonic_yang reports no Yang models.

Describe the results you expected:

sonic_yang reports ok.

Output of show version:

(paste your output here)

Output of show techsupport:

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Additional information you deem important (e.g. issue happens only occasionally):

[zhangyanzhao]

@sumukhatv can you please help to create the YANG model for RESTAPI table?

[sumukhatv]

@sumukhatv can you please help to create the YANG model for RESTAPI table?

@zhangyanzhao I am not working on this task

[zhangyanzhao]

@prsunny would you please help to find someone to enable the YANG for this RESTAPI table? Thanks.