[BREAKING][MySQL]Support Extra Definition (AUTO_INCREMENT / Generated column etc)

[k1LoW]

Fix #266

[codecov]

Codecov Report

Merging #268 (6037ce3) into master (3a5a7d9) will decrease coverage by 1.70%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
- Coverage   68.20%   66.49%   -1.71%     
==========================================
  Files          23       23              
  Lines        3859     3931      +72     
==========================================
- Hits         2632     2614      -18     
- Misses        968     1055      +87     
- Partials      259      262       +3     

Impacted Files	Coverage Δ
schema/schema.go	28.20% <0.00%> (-0.90%)	⬇️
output/md/md.go	68.95% <45.09%> (-4.70%)	⬇️
drivers/mysql/mysql.go	73.85% <45.83%> (-4.42%)	⬇️
datasource/datasource.go	21.96% <0.00%> (-12.55%)	⬇️

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