feat: create db for kvindexer in AppCreator

[Vritra4]

create db for kvindexer inside of AppCreator() in order to be easily customized

NOTE: breaking changes in app.toml due to bumped kvindexer

[codecov]

Codecov Report

Attention: Patch coverage is 15.38462% with 22 lines in your changes missing coverage. Please review.

Project coverage is 57.42%. Comparing base (b9484ca) to head (79098e3).

Files	Patch %	Lines
cmd/minitiad/root.go	0.00%	19 Missing ⚠️
app/encoding.go	33.33%	2 Missing ⚠️
app/app.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
- Coverage   57.90%   57.42%   -0.48%     
==========================================
  Files          16       16              
  Lines        1734     1750      +16     
==========================================
+ Hits         1004     1005       +1     
- Misses        689      704      +15     
  Partials       41       41              

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[beer-1]

LGTM