feat: use proper file extension based on content-type

[antoinechalifour]

No description provided.

[codecov-io]

Codecov Report

Merging #36 into master will increase coverage by 0.56%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #36      +/-   ##
=======================================
+ Coverage   98.44%   99%   +0.56%     
=======================================
  Files          19    20       +1     
  Lines         257   404     +147     
  Branches       38    38              
=======================================
+ Hits          253   400     +147     
  Misses          1     1              
  Partials        3     3

Impacted Files	Coverage Δ
...c/migrations/cache-fs/1-txt-to-proper-file-type.ts	100% <100%> (ø)
src/utils/path.ts	100% <100%> (ø)	⬆️
...infrastructure/repository/RequestRepositoryFile.ts	98.92% <100%> (-0.12%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2ac020f...1b28204. Read the comment docs.

[antoinechalifour]

Releasing this feature as-is will be a breaking change as the old request will not be found (they will still be in .txt files).

One option is to execute mv body.txt body.mp3 at runtime to allow for migrations without breaking Memento