Add Bitwise operation

[XIELongDragon]

No description provided.

[XIELongDragon]

@mattn please help to review this PR

[codecov]

Codecov Report

Merging #303 (a9804f4) into master (72349ff) will decrease coverage by 0.70%.
The diff coverage is 74.31%.

❗ Current head a9804f4 differs from pull request most recent head 1e9f0ab. Consider uploading reports for the commit 1e9f0ab to get more accurate results

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
- Coverage   96.81%   96.10%   -0.71%     
==========================================
  Files          61       62       +1     
  Lines        3355     3464     +109     
==========================================
+ Hits         3248     3329      +81     
- Misses         91      119      +28     
  Partials       16       16              

Flag	Coverage Δ
unittests	96.10% <74.31%> (-0.71%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
exp/bitwise.go	35.71% <35.71%> (ø)
exp/exp.go	71.42% <92.85%> (+4.28%)	⬆️
dialect/mysql/mysql.go	100.00% <100.00%> (ø)
dialect/sqlite3/sqlite3.go	100.00% <100.00%> (ø)
dialect/sqlserver/sqlserver.go	100.00% <100.00%> (ø)
exp/ident.go	100.00% <100.00%> (ø)
exp/literal.go	100.00% <100.00%> (ø)
sqlgen/expression_sql_generator.go	100.00% <100.00%> (ø)
sqlgen/sql_dialect_options.go	100.00% <100.00%> (ø)

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[XIELongDragon]

@doug-martin fixed lint, please re-run the CI

[doug-martin]

@XIELongDragon re-ran to get the output from golang ci, the issues are not annotated in the PR.