Add setSoaEdit and setSoaEditApi methods to Zone class

[mvdgeijn]

Description

Added the setSoaEdit and setSoaEditApi methods to the Zone class to be able to set the soa_edit and soa_edit_api domain metadata.

Motivation and context

Doesn't fix an open issue, just adding an extra feature

How has this been tested?

New methods tested on a live PowerDNS server v4.6

Screenshots (if appropriate)

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[mvdgeijn]

How can I add a label to this PR? The label should be 'new-feature'

[robbinjanssen]

Added a few dots at the end of lines :-)

[robbinjanssen]

@mvdgeijn tagged as v4.1.0. Thanks for your contribution!