Delete InMemory storage backend

[pohlm01]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 70.36%. Comparing base (84a37ba) to head (28ec082).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
openadr-vtn/src/main.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   70.42%   70.36%   -0.06%     
==========================================
  Files          32       32              
  Lines        3550     3553       +3     
==========================================
  Hits         2500     2500              
- Misses       1050     1053       +3     

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