feat(iploadbalancing): add ssl, pending-changes and refresh commands

[elvenarg]

Description

Add SSL certificate management and configuration apply commands to ovhcloud iploadbalancing.

Two commits, each building and passing tests on its own:

1. SSL certificates (ovhcloud iploadbalancing ssl ...)

Command	API call
ssl list <service_name>	GET /ipLoadbalancing/{serviceName}/ssl
ssl get <service_name> <ssl_id>	GET /ipLoadbalancing/{serviceName}/ssl/{id}
ssl create <service_name>	POST /ipLoadbalancing/{serviceName}/ssl
ssl delete <service_name> <ssl_id>	DELETE /ipLoadbalancing/{serviceName}/ssl/{id}

ssl create takes --certificate, --chain, --key and --display-name (PEM content, as in webhosting ssl service-create), and goes through common.CreateResource, so --from-file, --init-file, --editor and stdin are supported. certificate and key are required, as in the API schema.

2. Pending changes (ovhcloud iploadbalancing ...)

Command	API call
pending-changes <service_name>	GET /ipLoadbalancing/{serviceName}/pendingChanges
refresh <service_name> [--zone]	POST /ipLoadbalancing/{serviceName}/refresh

pending-changes supports --filter. refresh applies the pending configuration on all zones, or only on --zone, and returns the created task.

Notes for reviewers:

• ssl list: the API returns a bare list of IDs; they are rendered as [{"id": 1}, ...] so they go through display.RenderTable like other lists.
• ssl get / ssl delete reject a non-numeric ssl_id before calling the API.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have commented my code
• I ran go mod tidy
• I have added tests that prove my fix is effective or that my feature works

make fmt, make build, make wasm, make test and make doc were run; doc/ovhcloud.md is unchanged.

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