Fix image transform on Windows server by forcing temporary path

[ctessier]

Introduction

This issue seems to occur when running PHP on a Windows server.
This pull requests fixes #52, fixes #72, fixes #92, fixes #100, fixes #101

Error

Intervention throws Encoding format (tmp) is not supported.
This happens because the package uses the Laravel's UploadedFile directly when doing the crop/resize transformation. It tries to save it after the transformation and before passing it onto Laravel for final storage. But at this point, the UploadedFile is still in a temp folder.
On Windows, it seems that Intervention struggles to determine the file's extension and uses tmp, which fails.

Solution

Forcing the extension using the one from the UploadedFile seems to work.
This pull requests therefore provides parameters to the Intervention's save method to specify the full path (even though it's still the temp one) and most importantly, the extension.

[sonarcloud]

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