[sqlite] Take DB path rather than opened database

[AlCutter]

This PR makes the sqlite persistence c'tor use a path (via opts struct) to an sqlite DB file, rather than taking an opened DB.

The sqlite pragma options are important for the durability and correctness of the witness DB, so we shouldn't rely on the caller having correctly added them when opening a DB.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 64.70588% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 25.30%. Comparing base (d94ec97) to head (e5bbea3).

Files with missing lines	Patch %	Lines
cmd/omniwitness/monolith.go	0.00%	4 Missing ⚠️
persistence/sqlite/sql.go	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #564      +/-   ##
==========================================
+ Coverage   24.98%   25.30%   +0.31%     
==========================================
  Files          27       27              
  Lines        2025     2035      +10     
==========================================
+ Hits          506      515       +9     
  Misses       1409     1409              
- Partials      110      111       +1     

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