feat(instance): support snapshot based instance

[tormath1]

Hi,

In this PR I tried to allow the CLI to deploy an instance directly from a snapshot without calling the marketplace API.

scw instance server \
  create image=none \
  root-volume=l:11111...11 \
  cloud-init=@/tmp/config.json

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Release note for CHANGELOG:

NONE

[Codelax]

getImageResponse is shadowing the one created in previous context.

Suggested change

	getImageResponse, err := apiInstance.GetImage(&instance.GetImageRequest{
	var err error
	getImageResponse, err = apiInstance.GetImage(&instance.GetImageRequest{

[Codelax]

serverType shadows the one created in previous context

Suggested change

	serverType := getServerType(apiInstance, serverReq.Zone, serverReq.CommercialType)
	serverType = getServerType(apiInstance, serverReq.Zone, serverReq.CommercialType)

[tormath1]

Oops thanks a lot. Missed that. That should explain the failing CI.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 69.25%. Comparing base (5bf53e0) to head (3073489).
Report is 128 commits behind head on master.

Files	Patch %	Lines
...nal/namespaces/instance/v1/custom_server_create.go	83.33%	4 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (3073489). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (3073489)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3787      +/-   ##
==========================================
- Coverage   75.45%   69.25%   -6.21%     
==========================================
  Files         202      288      +86     
  Lines       44323    54603   +10280     
==========================================
+ Hits        33444    37814    +4370     
- Misses       9653    15256    +5603     
- Partials     1226     1533     +307     

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[tormath1]

@remyleone do you want me to rebase on master?

[remyleone]

Thanks a lot @tormath1 for your contribution :)