[V2] [File upload] Access file size, mime type, encoding and original file name

[LoicPoullain]

Issue

Resolves #673

Solution and steps

• Add File class
• Use File class and return mime type, encoding and original file name in @ ValidateMultipartFormDataBody.
• Disk(s): add readSize.

How to upgrade (to include in v2 release)

If you use @ValidateMultipartFormDataBody with buffers, update your code as follows:

// Before
const buffer = ctx.request.body.files.foobar;

// After
const { buffer } = ctx.request.body.files.foobar;

If you extend the abstract class AbstractDisk (i.e. you implement your own Disk), you must add a readSize method which returns the size of the file.

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

[codecov-commenter]

Codecov Report

Merging #730 into v2-0-0 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           v2-0-0     #730   +/-   ##
=======================================
  Coverage   99.58%   99.58%           
=======================================
  Files          94       94           
  Lines        1706     1706           
  Branches      380      380           
=======================================
  Hits         1699     1699           
  Misses          7        7           

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