feat(natives): implement `GET_MOUNTED_FILE_HASH`

[PichotM]

Goal of this PR

This PR introduces a new native GET_MOUNTED_FILE_HASH.

How is this PR achieving the goal

By implementing the native using the same logic as puremode's hashes.

This PR applies to the following area(s)

FiveM & RedM client

Successfully tested on

FiveM and will most likely work in RedM too.

Game builds: 3095

Platforms: Windows

Checklist

• [x] Code compiles and has been tested successfully.
• [x] Code explains itself well and/or is documented.
• [x] My commit message explains what the changes do and what they are for.
• [x] No extra compilation warnings are added by these changes.