Add --description flag to create type CLI commands

[luissimas]

Adds a --description CLI flag to the following commands:

• config trust add-certificate
• cluster group create
• create
• image alias create
• launch
• network create
• network acl create
• network acl rule add
• network forward create
• network forward port add
• network load-balancer create
• network load-balancer backend add
• network load-balancer port add
• network peer create
• network zone create
• network zone record add
• profile create
• project create
• storage create
• storage bucket create
• storage bucket key create
• storage volume create
• storage volume snapshot create
• snapshot create

The flag allow users to set a description on the resources when they create them, instead of having to update the description after the creation.

For the snapshot create and storage volume snapshot create commands, some changes were made to the API and the incusd daemon, since the description field was not supported on the server side. Additionally, the new description field is shown in the output of incus storage volume snapshot list, incus snapshot list and incus info.

Closes #1485

[luissimas]

@stgraber opening as a draft because I still want to add some test cases for the commands. Is the test/suites/*.sh the intended place for such tests?

I did some manual tests to validate most of the changes, but I was a bit limited by my local setup to test the network commands. Also, I'm not sure about the changes for snapshots, specially the default description values for the scheduled/automatic snapshots.

[stgraber]

@stgraber opening as a draft because I still want to add some test cases for the commands. Is the test/suites/*.sh the intended place for such tests?

Yeah, you can have a few of the commands in there start passing --description for testing.

[stgraber]

Looks good overall. I'll have to take a closer look at the snapshot description stuff as I now have a nagging feeling that we have those fields read-only as we want the snapshot to capture and restore the instance or volume's own description.

If that's indeed the case, we'll then want to just remove the ability to set a description on snapshots at creation time which will also make this PR a bit simpler.