feat(instance): support more IP options in server creation

[Codelax]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.45205% with 15 lines in your changes missing coverage. Please review.

Project coverage is 70.90%. Comparing base (5bf53e0) to head (42e4c99).
Report is 304 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/instance/v1/custom_ip.go	62.50%	10 Missing and 2 partials ⚠️
...nal/namespaces/instance/v1/custom_server_create.go	76.92%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4219      +/-   ##
==========================================
- Coverage   75.45%   70.90%   -4.56%     
==========================================
  Files         202      294      +92     
  Lines       44323    65580   +21257     
==========================================
+ Hits        33444    46497   +13053     
- Misses       9653    17452    +7799     
- Partials     1226     1631     +405     

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