Custom ssl add opts

[jterzis]

Description

Rightsized ssl client to include new fields represented in api: geo_restrictions, type.
See api docs for resource : https://api.cloudflare.com/#custom-ssl-for-a-zone-create-ssl-configuration

Has your change been tested?

Tested against updated tests in ssl_test.go. For example, go test -v -run TestCreateSSL

Types of changes

What sort of change does your code introduce/modify?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.