Add creation time to stores

[davidsteiner]

Creation time is added to all supported message stores. The creation time is persisted and retained between instances of the store. Resets reset the time to the current time.

Support for DynamoDB was dropped as it's not a priority right now.

[codecov]

Codecov Report

Attention: Patch coverage is 92.41379% with 11 lines in your changes missing coverage. Please review.

Project coverage is 53.13%. Comparing base (bee0176) to head (1dc466b).

Files with missing lines	Patch %	Lines
crates/hotfix/src/store/redb.rs	87.50%	10 Missing ⚠️
crates/hotfix/tests/store_tests.rs	97.14%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   45.78%   53.13%   +7.34%     
==========================================
  Files          58       58              
  Lines        2564     2522      -42     
==========================================
+ Hits         1174     1340     +166     
+ Misses       1390     1182     -208     

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