Change UploadedFileMetaData interface's size property to number from string type.

[eramin]

Title^

[ ] Regression 
[] Bug report
[x] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

String type.

Expected behavior

Number type.

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

So i could use discriminating union in my storage module, because Express.Multer.File interface has it as a number property.

Environment

Nest version: 8.1.2
 
For Tooling issues:
- Node version: v14.18.1
- Platform:  MacOS Monterey 12.0.1

Others:
-