feat(instance_image): support block snapshots

[Codelax]

Close #2819

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.08642% with 38 lines in your changes missing coverage. Please review.

Project coverage is 67.65%. Comparing base (fe86049) to head (ce84475).
Report is 235 commits behind head on master.

Files with missing lines	Patch %	Lines
...ternal/services/instance/helpers_instance_block.go	0.00%	34 Missing ⚠️
internal/services/instance/server.go	72.72%	2 Missing and 1 partial ⚠️
internal/services/instance/types.go	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2823      +/-   ##
==========================================
- Coverage   71.43%   67.65%   -3.79%     
==========================================
  Files         277      339      +62     
  Lines       35875    40036    +4161     
==========================================
+ Hits        25628    27087    +1459     
- Misses       8028    10637    +2609     
- Partials     2219     2312      +93     

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