IPAM: add support for ippool

[zhangzujian]

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

• Feature

Which issue(s) this PR fixes:

Fixes #(issue-number)

WHAT

🤖 Generated by Copilot at 0fa880d

This pull request adds a new IPPool resource type to the kube-ovn API, which represents a pool of IP addresses that can be allocated to pods or other resources. It also refactors the condition types for various resources to use a common Condition type. It updates the controller, the clientset, the informers, the listers, the charts, and the workflow to support the new resource and the refactored types.

🤖 Generated by Copilot at 0fa880d

Oh we are the kube-ovn crew, and we have a job to do
We'll add a new IPPool type, and make the code more tight
Heave away, me hearties, heave away
On the count of three, we'll push the PR and sail the IPAM sea

HOW

🤖 Generated by Copilot at 0fa880d

• Increase the timeout-minutes for the build-x86-image workflow to avoid premature cancellation (link)
• Add a new IPPool resource type for managing a pool of IP addresses (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Refactor the condition types for various resources to use a generic Condition type (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Add a new key mutex field to the Controller type for synchronizing access to the IPPool resources (link)
• Initialize the informer, lister, and work queues for the IPPool resources in the Run function of the Controller type (link, link, link)
• Use the numKeyLocks constant for the npKeyMutex field of the Controller type (link)
• Shut down the work queues for the IPPool resources in the shutdown function of the Controller type (link)
• Add worker functions to process the IPPool resources from the work queues in the startWorkers function of the Controller type (link, link)
• Initialize the IPAM module with the existing IPPool resources in the InitIPAM function of the Controller type (link)
• Use the podNet.Subnet.Name field instead of the pod annotation for the subnet variable in the InitIPAM function of the Controller type (link)

[zhangzujian]

@oilbeater Please review. Test cases will be added later.