Ready state changes require a bump to the message to re-sequence it

[peterbroadhurst]

Fixes the core symptom reported in #421

Note that this does not implement the full change to batches described in the discussion on that issue.
However, when that change happens, this fix will still be applicable.

[awrichar]

Could also call it simply "ReplaceMessage" - will leave it up to you if you prefer the current name though.

[codecov-commenter]

Codecov Report

Merging #438 (3a32ae6) into main (afb4c84) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #438   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          277       277           
  Lines        14939     14955   +16     
=========================================
+ Hits         14939     14955   +16     

Impacted Files	Coverage Δ
internal/database/sqlcommon/message_sql.go	100.00% <100.00%> (ø)
internal/events/tokens_transferred.go	100.00% <100.00%> (ø)

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