update rome config and example

[drieshooghe]

• 🔨 update rome config
• ✨ if the dynamodb collections exist, skip the setup
• ✨ update example

This PR

• fixes the Rome config to the new format
• uses dynamodb in the example
• doesn't try to create event and snapshot collections if they already exist

[codecov]

Codecov Report

Merging #54 (e0dab65) into master (6f5966f) will decrease coverage by 0.32%.
The diff coverage is 73.91%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
- Coverage   92.32%   92.00%   -0.33%     
==========================================
  Files          89       89              
  Lines        1355     1375      +20     
  Branches      269      277       +8     
==========================================
+ Hits         1251     1265      +14     
- Misses        100      106       +6     
  Partials        4        4              

Impacted Files	Coverage Δ
lib/integration/event-store/mongodb.event-store.ts	97.33% <66.66%> (-1.28%)	⬇️
...tegration/snapshot-store/mongodb.snapshot-store.ts	98.18% <66.66%> (-0.89%)	⬇️
...ib/integration/event-store/dynamodb.event-store.ts	95.04% <75.00%> (-1.76%)	⬇️
...egration/snapshot-store/dynamodb.snapshot-store.ts	96.50% <75.00%> (-1.30%)	⬇️
lib/models/aggregate-root.ts	100.00% <100.00%> (ø)

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