Config option to remove all temporary data at startup

[gammazero]

Context

Temporary data, that has been abandoned, may accumulate over time. It may be desirable to get rid of it between indexer runs.

Proposed Changes

Adds a new config file option to remove temporary data at start time.

Tests

Unit tests to check that feature works correctly

Revert Strategy

Change is safe to revert.

[codecov-commenter]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Comparison is base (79199f3) 48.05% compared to head (407ebd5) 48.40%.

Files	Patch %	Lines
command/datastore.go	21.62%	25 Missing and 4 partials ⚠️
command/daemon.go	0.00%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2395      +/-   ##
==========================================
+ Coverage   48.05%   48.40%   +0.34%     
==========================================
  Files          82       82              
  Lines        9788     9792       +4     
==========================================
+ Hits         4704     4740      +36     
+ Misses       4550     4507      -43     
- Partials      534      545      +11     

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