feat: Expand plugin interface GetSegments()

[engedaam]

What type of PR is this?

/kind feature

This change extends the EBS CSI driver plugin interface to support custom node topology segments that can be propagated to Kubernetes resources.

What is this PR about? / Why do we need it?

• Added GetNodeSegments() method to the EbsCsiPlugin interface, allowing plugins to provide additional topology segments
• Introduced SetNodeSegments() and GetNodeSegments() utility functions to manage plugin-provided segments globally
• Updated controller and node services to merge plugin segments with existing topology information (zone, OS, outpost ARN)
• Modified all relevant tests to account for the new segment merging behavior using lo.Assign()

Dependencies:

• Added github.com/samber/lo for convenient map merging operations

How was this change tested?

• make test

Does this PR introduce a user-facing change?

NONE

[github-actions]

Code Coverage Diff

File	Old Coverage	New Coverage	Delta
github.com/kubernetes-sigs/aws-ebs-csi-driver/pkg/driver/node.go	89.5%	88.3%	-1.2
github.com/kubernetes-sigs/aws-ebs-csi-driver/pkg/util/util.go	56.3%	51.3%	-5.1

[engedaam]

/retest

[k8s-ci-robot]

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[engedaam]

/retest

[torredil]

Requested changes, also make verify is failing and needs to be fixed before merge.

[torredil]

GetNodeSegments() returns an empty map here since nothing calls SetNodeSegments with actual data, so this test passes whether or not the merge works. Can we add a test that sets some segments and checks they show up in the response?

[engedaam]

This is expected. Once a consumer has loaded the test with a plugin the segments will be updated to the correct value. This is how the remaining of the tests have been configured for the plugin

[torredil]

/assign @ConnorJC3

[k8s-ci-robot]

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