Use functional options pattern for initialising `NodeServer`

[vadasambar]

Based on #71 (comment)

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]

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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