Add Column Metadata

[alespour]

This is a follow-up to PR #187 that seems to be stalled as the original poster seems to be no longer active). I took the changes and refactored them.

[codecov-commenter]

Codecov Report

Merging #231 into master will increase coverage by 0.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
+ Coverage   94.20%   94.59%   +0.38%     
==========================================
  Files          18       19       +1     
  Lines         915      980      +65     
==========================================
+ Hits          862      927      +65     
  Misses         38       38              
  Partials       15       15              

Impacted Files	Coverage Δ
rows.go	89.13% <ø> (ø)
sqlmock.go	93.30% <ø> (ø)
sqlmock_before_go18.go	100.00% <ø> (ø)
column.go	100.00% <100.00%> (ø)
expectations_go18.go	95.45% <100.00%> (+0.71%)	⬆️
rows_go18.go	92.85% <100.00%> (+21.42%)	⬆️
sqlmock_go18.go	100.00% <100.00%> (ø)

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[l3pp4rd]

Thanks, will have a look the coming week

[l3pp4rd]

will check for a while if people find any bugs in master before tagging a release, thanks

[alespour]

will check for a while if people find any bugs in master before tagging a release, thanks

@l3pp4rd what do you think, is it ok now for a new release? Thank you.
btw I'm glad you seem to have found new maintainers.