Decouple seeding from server entrypoint

[terror]

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[codecov]

Codecov Report

Attention: Patch coverage is 9.37500% with 29 lines in your changes missing coverage. Please review.

Project coverage is 84.53%. Comparing base (e460ad8) to head (2738bb0).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/seeder.rs	0.00%	13 Missing ⚠️
src/subcommand.rs	0.00%	5 Missing ⚠️
automation/src/main.rs	0.00%	3 Missing ⚠️
src/arguments.rs	0.00%	3 Missing ⚠️
src/server.rs	0.00%	2 Missing ⚠️
crates/db/src/initializer.rs	75.00%	1 Missing ⚠️
src/main.rs	0.00%	1 Missing ⚠️
src/options.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #667      +/-   ##
==========================================
+ Coverage   84.13%   84.53%   +0.40%     
==========================================
  Files          38       40       +2     
  Lines        6276     6148     -128     
==========================================
- Hits         5280     5197      -83     
+ Misses        996      951      -45     

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