Add API for Custom Links

[fabi125]

Environment

• Python version: 3.6.5
• NetBox version: 2.10.3

Proposed Functionality

Expose the functionality that is currently available in the Admin UI under Extras -> Custom fields via the Rest API to be able to add/update/delete custom links.

Use Case

We would like to store the custom link configuration in source control and configure Netbox via the API.

See also #5610.

Database Changes

None.

External Dependencies

None.

[stale]

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