Rework merging DB connection configuration

[pkosiec]

• Ability to provide partialConfig object when using DB URI in constructor (Resolves: Ability to provide partialConfig object when using DB URI in constructor #196)
• Fix encoding password in MongoDB connection URI (Resolves: Fix encoding password in MongoDB connection URI  #209)

[codecov]

Codecov Report

Merging #214 (e3dc6ae) into main (b9a1542) will decrease coverage by 1.54%.
The diff coverage is 84.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
- Coverage   92.80%   91.27%   -1.54%     
==========================================
  Files          18       17       -1     
  Lines         278      298      +20     
  Branches       56       62       +6     
==========================================
+ Hits          258      272      +14     
- Misses         12       17       +5     
- Partials        8        9       +1     

Flag	Coverage Δ
cli	93.75% <ø> (ø)
core	90.59% <84.00%> (-1.93%)	⬇️

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Files	Coverage Δ
cli/src/options.ts	92.15% <ø> (ø)
core/src/database/database-connector.ts	100.00% <100.00%> (ø)
core/src/database/index.ts	100.00% <ø> (ø)
core/src/database/database.ts	87.80% <90.47%> (+2.80%)	⬆️
core/src/config.ts	81.57% <76.00%> (-12.18%)	⬇️

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