feat(fracmanager): parallelize seals on replay

[cheb0]

Description

Makes frac manager replay and seal fractions in parallel. This will speed up the process of store startup.

Fixes #161

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.17%. Comparing base (3a431ab) to head (fba8263).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
fracmanager/fracmanager.go	93.93%	2 Missing ⚠️
cmd/seq-db/seq-db.go	0.00%	1 Missing ⚠️
config/validation.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #169      +/-   ##
==========================================
- Coverage   71.21%   71.17%   -0.04%     
==========================================
  Files         198      199       +1     
  Lines       18219    18348     +129     
==========================================
+ Hits        12975    13060      +85     
- Misses       4521     4561      +40     
- Partials      723      727       +4     

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[forshev]

we can use assert.ErrorIs() here too

[cheb0]

I also removed previous assert assert.Error(t, err), since it looks unnecessary with two assert checks that comes later