stackit ccm use new stackit client

[aniruddha2000]

How to categorize this PR?

/kind enhancement

What this PR does / why we need it:

This PR is a part of breaking down #1060 PR into smaller pieces, where we are having ccm using new stackit client.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

IaaS functions being added

GetServer
ListServers

LoadBalancer functions being added

CreateLoadBalancer
GetLoadBalancer
UpdateLoadBalancer
DeleteLoadBalancer
UpdateTargetPool

CreateCredentials
ListCredentials
UpdateCredentials
DeleteCredentials

In-terms of client code, there is no major changes, just it follows new way of using the stackit client.

NOTE:

In respective of testing the ccm uses the new client and the unit tests are being changed but we need to test it on ondemand.

Breaking changes:

[ske-prow]

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[aniruddha2000]

/test pull-cloud-provider-stackit-verify

[breuerfelix]

/cherrypick release-v1.33
/cherrypick release-v1.34
/cherrypick release-v1.35
/cherrypick release-v1.36

[stackit-ske]

@breuerfelix: once the present PR merges, I will cherry-pick it on top of release-v1.33, release-v1.34, release-v1.35, release-v1.36 in new PRs and assign them to you.

Details

In response to this:

/cherrypick release-v1.33
/cherrypick release-v1.34
/cherrypick release-v1.35
/cherrypick release-v1.36

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