fix(readMultipartFormData): handle utf8 encoding for name and filename

[zhiyuanzmj]

After I uploaded a file with a Chinese name:

20xx年xx月xx日一号楼电表数据模版.xlsx

the filename was parsed as ISO-8859-1 encoding:

20xxå¹´xxæ__xxæ_¥ä¸_å_·æ¥¼ç_µè¡¨æ_°æ_®æ¨¡ç__.xlsx

So I used Buffer to convert it to UTF-8.

let filename = "20xxå¹´xxæxxæ¥ä¸å·æ¥¼çµè¡¨æ°æ®æ¨¡ç.xlsx";
let buffer = Buffer.from(filename, 'latin1');
filename = buffer.toString('utf8');
console.log(filename);

[Hebilicious]

This looks fine to me @pi0

[codecov]

Codecov Report

Merging #416 (0185754) into main (ed3ae90) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
+ Coverage   78.36%   78.38%   +0.02%     
==========================================
  Files          26       26              
  Lines        2792     2795       +3     
  Branches      408      407       -1     
==========================================
+ Hits         2188     2191       +3     
  Misses        604      604              

Impacted Files	Coverage Δ
src/utils/internal/multipart.ts	97.40% <100.00%> (+0.05%)	⬆️

[pi0]

Thanks!