chore: add staticcheck pre-commit hook

[kwanhur]

• upgrade pre-commit-golang to v0.5.0
• enable staticcheck hook on pre-commit

related issue #1017 (comment)

test case:

➜  bfe git:(precommit-sc) ✗ git add bfe_cli/a.go 
➜  bfe git:(precommit-sc) ✗ git cm "test check"
go fmt...................................................................Passed
go vet...................................................................Passed
go-unit-tests............................................................Passed
go-build.................................................................Passed
go staticcheck...........................................................Failed
- hook id: go-static-check
- exit code: 1

bfe_cli/a.go:3:5: var name is unused (U1000)
bfe_cli/a.go:5:6: func main is unused (U1000)

[codecov-commenter]

Codecov Report

Merging #1019 (c491e73) into develop (d5b10d7) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1019      +/-   ##
===========================================
+ Coverage    54.24%   54.26%   +0.01%     
===========================================
  Files          301      301              
  Lines        26602    26602              
===========================================
+ Hits         14431    14436       +5     
+ Misses       10508    10504       -4     
+ Partials      1663     1662       -1     

Impacted Files	Coverage Δ
bfe_util/fixed_pool.go	83.33% <0.00%> (-16.67%)	⬇️
bfe_spdy/frame_write.go	50.50% <0.00%> (ø)
bfe_spdy/server_conn.go	78.53% <0.00%> (ø)
bfe_http2/server.go	72.52% <0.00%> (+0.16%)	⬆️
bfe_websocket/server_conn.go	78.03% <0.00%> (+3.78%)	⬆️

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