Use functional options pattern for initialising `NodeServer`

[vadasambar]

Based on https://github.com/warm-metal/csi-driver-image/pull/71#discussion_r1399270506

Other refs around this pattern:

• https://golang.cafe/blog/golang-functional-options-pattern.html

TODO

• [ ] identify places where such pattern can be used in the code
• [ ] make changes in such places
• [ ] create a PR
• [ ] get it reviewed and merged
• [ ] DONE

[github-actions[bot]]

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[mbtamuli]

@mugdha-adhav Please add one of the labels mentioned here - https://github.com/warm-metal/csi-driver-image/blob/master/docs/automation.md#maintenance

Maybe help-wanted