💥 Remove builtin sqlite3 adapter

[Fs02]

Extracted to: https://github.com/go-rel/sqlite3

[codecov]

Codecov Report

Merging #257 (537965a) into master (3243db8) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #257   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           54        53    -1     
  Lines         3840      3790   -50     
=========================================
- Hits          3840      3790   -50     

Impacted Files	Coverage Δ
cmd/rel/internal/util.go	100.00% <100.00%> (ø)

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