Minimal transaction support in v2 delegate.

[isoos]

Enables error_handling_test.dart in V3=1 mode.

[codecov-commenter]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (7c0f34d) 85.05% compared to head (9a74666) 84.58%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
- Coverage   85.05%   84.58%   -0.48%     
==========================================
  Files          30       30              
  Lines        2623     2640      +17     
==========================================
+ Hits         2231     2233       +2     
- Misses        392      407      +15     

Files	Coverage Δ
lib/src/v3/connection.dart	87.46% <35.71%> (-0.62%)	⬇️
lib/src/v2_v3_delegate.dart	0.00% <0.00%> (ø)

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