feat(baremetal): add support for add flexible ip

[Laure-di]

close #2883

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.64516% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 77.43%. Comparing base (5bf53e0) to head (04b237c).
Report is 27 commits behind head on master.

Files	Patch %	Lines
...ernal/namespaces/baremetal/v1/custom_server_fip.go	86.56%	6 Missing and 3 partials ⚠️
...amespaces/baremetal/v1/custom_server_fip_prompt.go	61.90%	5 Missing and 3 partials ⚠️
internal/interactive/list.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3670      +/-   ##
==========================================
+ Coverage   75.45%   77.43%   +1.98%     
==========================================
  Files         202      209       +7     
  Lines       44323    38302    -6021     
==========================================
- Hits        33444    29661    -3783     
+ Misses       9653     7376    -2277     
- Partials     1226     1265      +39     

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