[draft] fix: random lint issues

[dakimura]

• remove GetByName function because GetColumn function does the same thing
• separate wal.WriteBuffer process by record type to remove type assertions
• random small lint fixes

[codecov-commenter]

Codecov Report

Merging #592 (d10671e) into master (9b762c3) will increase coverage by 0.05%. The diff coverage is 62.29%.

@@            Coverage Diff             @@
##           master     #592      +/-   ##
==========================================
+ Coverage   48.76%   48.81%   +0.05%     
==========================================
  Files         138      138              
  Lines       12919    12926       +7     
==========================================
+ Hits         6300     6310      +10     
+ Misses       6062     6056       -6     
- Partials      557      560       +3     

Impacted Files	Coverage Δ
cmd/connect/loader/utils.go	0.00% <0.00%> (ø)
cmd/connect/loader/write.go	0.00% <0.00%> (ø)
executor/writer.go	46.56% <ø> (ø)
utils/io/byteconversions.go	91.30% <ø> (ø)
utils/io/generics.go	44.39% <0.00%> (ø)
utils/io/metadata.go	69.58% <ø> (ø)
executor/buffile/buffile.go	72.00% <33.33%> (-3.00%)	:arrow_down:
utils/io/columnseries.go	56.11% <42.85%> (-0.27%)	:arrow_down:
executor/wal.go	62.91% <60.60%> (-1.43%)	:arrow_down:
cmd/connect/session/client.go	37.66% <83.33%> (-0.22%)	:arrow_down:
... and 8 more

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.0% Duplication