Fix lint error

[is2ei]

Changes

• This PR suppresses lint error on WIP implementation.
• This PR adds the lint command to the pre-commit hook.

References

https://github.com/nodejs/undici/runs/5610494557?check_suite_focus=true

> undici@4.1[6](https://github.com/nodejs/undici/runs/5610494557?check_suite_focus=true#step:5:6).0 lint
> standard | snazzy

standard: Use JavaScript Standard Style (https://standardjs.com)

/home/runner/work/undici/undici/lib/fetch/index.js
  15[8](https://github.com/nodejs/undici/runs/5610494557?check_suite_focus=true#step:5:8)[9](https://github.com/nodejs/undici/runs/5610494557?check_suite_focus=true#step:5:9):[11](https://github.com/nodejs/undici/runs/5610494557?check_suite_focus=true#step:5:11)  error  'newConnection' is assigned a value but never used

✖ 1 problem
Error: Process completed with exit code 1.

[codecov-commenter]

Codecov Report

Merging #1293 (129d71e) into main (a15bef3) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1293      +/-   ##
==========================================
- Coverage   94.14%   94.12%   -0.03%     
==========================================
  Files          44       44              
  Lines        4100     4100              
==========================================
- Hits         3860     3859       -1     
- Misses        240      241       +1     

Impacted Files	Coverage Δ
lib/fetch/index.js	77.90% <100.00%> (ø)
lib/fetch/request.js	85.06% <0.00%> (-0.42%)	⬇️

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[mcollina]

lgtm