Use optimistic inserts for blockchain events

[awrichar]

Always attempt to insert first, then fall back to a query for duplicates.

[codecov-commenter]

Codecov Report

Merging #977 (ad5cff2) into main (b8556a4) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head ad5cff2 differs from pull request most recent head 0e55946. Consider uploading reports for the commit 0e55946 to get more accurate results

@@            Coverage Diff             @@
##             main     #977      +/-   ##
==========================================
- Coverage   99.99%   99.98%   -0.02%     
==========================================
  Files         299      299              
  Lines       19581    19588       +7     
==========================================
+ Hits        19580    19585       +5     
- Misses          1        2       +1     
- Partials        0        1       +1     

Impacted Files	Coverage Δ
...nternal/database/sqlcommon/blockchainevents_sql.go	100.00% <100.00%> (ø)
internal/events/blockchain_event.go	100.00% <100.00%> (ø)
internal/orchestrator/data_query.go	100.00% <100.00%> (ø)
internal/txcommon/txcommon.go	100.00% <100.00%> (ø)
internal/apiserver/server.go	99.12% <0.00%> (-0.88%)	⬇️

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