Feature Request: webui: add parsing progress

[catap]

Prerequisites

• [x] I am running the latest code. Mention the version if possible as well.
• [x] I carefully followed the README.md.
• [x] I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• [x] I reviewed the Discussions, and have a new and useful enhancement to share.

Feature Description

Adding a statisics with speed of parsing promt token, like webui has for token generation.

Ideally show:

• context: xxx / max (Y%)
• input: ... / xxx (Z%)
• A.B t/s

Motivation

Right now webui has nice progress and speed for token generation, but when it on parsing large input, for 10k or 20k tokens... user see just Processing... for quite a while.

Possible Implementation

No response

[NoahOksuz]

test it and let me know if it fulfills your expectations for this enhancement @catap