Add extra officers fields to list officers

[kevbite]

Seems that the responses in the API have extra information on the officers, we should replicate that in the SDK. See #84

https://developer.companieshouse.gov.uk/api/docs/company/company_number/officers/officerList-resource.html

[sakisk]

Missing information from officers to be added:

• [x] occupation
• [x] address
• [x] country_of_residence
• [x] former_names
• [x] identification

@kevbite add here anything i might have missed

[kevbite]

Looks good 👍

[kevbite]

All merged in and available from version 6.1.0.

Thanks for contributing!