feat(block): add volume wait command

[Codelax]

It would be great to be able to wait for a volume to be detached. Some of our instance's tests currently use instance volume wait but will need this new command when we switch to sbs volumes.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 57.14286% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.72%. Comparing base (5bf53e0) to head (a0f3733).
⚠️ Report is 1048 commits behind head on master.

Files with missing lines	Patch %	Lines
...nternal/namespaces/block/v1alpha1/custom_volume.go	53.84%	11 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4434      +/-   ##
==========================================
- Coverage   75.45%   70.72%   -4.73%     
==========================================
  Files         202      298      +96     
  Lines       44323    66078   +21755     
==========================================
+ Hits        33444    46734   +13290     
- Misses       9653    17698    +8045     
- Partials     1226     1646     +420     

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