Added extra migration hooks.

[mcneely]

Added setup, cleanup, transaction_setup, transaction_cleanup, pretransaction_up/down, postcommit_up/down.

[codecov-io]

Codecov Report

Merging #174 into master will increase coverage by <.01%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   63.62%   63.62%   +<.01%     
==========================================
  Files          25       25              
  Lines        2771     2785      +14     
==========================================
+ Hits         1763     1772       +9     
- Misses       1008     1013       +5

Impacted Files	Coverage Δ
lib/Task/Db/Migrate.php	59.86% <64.28%> (+0.44%)	✅

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