HTTP Sampler/Files upload tab - add missing buttons

**eR@SeR** ([Bug 65020](https://bz.apache.org/bugzilla//show_bug.cgi?id=65020&redirect=false)):
Hello,

Files upload tab in HTTP Sampler is missing Detail, Add from clipboard, Up and Down buttons that are available in Parameters tab. By adding those buttons, user will be able to edit File path, Parameter and MIME-type values with more ease, Duplicate already added file upload parameter and sort two or more files as per his needs respectively.

Jmeter 5.4.1 10acbc7
Microsoft Windows 10 Pro 64-bit
java version "1.8.0_251"

Created attachment [HTTP Sampler File upload - Detail, Add from clipboard, Up, Down buttons.jpg](https://apache.github.io/jmeter-bugzilla-attachments/20/65020/37640/HTTP%20Sampler%20File%20upload%20-%20Detail,%20Add%20from%20clipboard,%20Up,%20Down%20buttons.jpg): Detail, Add from clipboard, Up, Down buttons are missing

Version: Nightly
OS: All