Add geodns support to cloudns provider

[anolek]

Hello,

Is your feature request related to a problem? Please describe.
I want to manage my dns record which are using geodns feature

Describe the solution you'd like
Add support for geodns for cloudns provider.
Adding geodns-location and/or geodns-code for A, AAAA, CNAME, NAPTR and SRV record only.

Describe alternatives you've considered
Cloned the git, adding the missing feature as "metadata" only for the compatible record (inspired by https://docs.dnscontrol.org/provider/huaweicloud) and panic if used with an incompatible record.

// Something like this
A("test", "1.2.3.4", {geodns_location: "103"});
A("test", "1.2.3.4", {geodns_location: "109"})

Additional context
Unsure if adding a "metadata" option is the best idea.
If it is, I can try to send a PR after adding tests and docs.
Let me know what you think.

Thank you

[tlimoncelli]

Hello friend!

Sounds good. Would love to get a PR!

Storing it in metadata is the right solution. That's exactly what it was made for. You can make it a little more user-friendly by putting this in pkg/js/helpers.js:

function CLOUDNS_GEO(g) {
    return { cloudns_geo: g };
}

Then you can use it like this:

    A("test", "1.2.3.4", CLOUDNS_GEO(103));

Some notes:

• Everything is prefixed with the provider's name so that it doesn't overlap with anyone else.
• I didn't test the code but it looks approximately correct :-)
• When you add tests tointegrationTest/integration_test.go, please mark them only(CLOUDNS) and use the .withMeta modifier to add the metadata. See "GCORE metadata tests" for examples.