Implement query timeout + enable both v2 and v3 adapter tests

[isoos]

Note: PgStatement.run has a breaking change in method signature. to be reviewed with the rest of v3 soon.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (d9f919b) 83.43% compared to head (239dc2b) 86.54%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
+ Coverage   83.43%   86.54%   +3.11%     
==========================================
  Files          30       30              
  Lines        2686     2698      +12     
==========================================
+ Hits         2241     2335      +94     
+ Misses        445      363      -82     

Files	Coverage Δ
lib/postgres_v3_experimental.dart	51.16% <100.00%> (ø)
lib/src/v2_v3_delegate.dart	66.92% <100.00%> (+66.92%)	⬆️
lib/src/v3/connection.dart	87.87% <100.00%> (+0.65%)	⬆️
lib/src/v3/pool.dart	87.30% <100.00%> (ø)

... and 1 file with indirect coverage changes

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