[Feature]: calculate Network Size

[rentalhost]

What happened?

Hey there! Right now, when we talk about Response Size, we're only looking at the uncompressed size. But, if we throw in something like Accept-Encoding: br (you know, for compression), we also want to take a peek at the Network Size, like Chrome Network tab does.

Steps to reproduce?

1. Launch app;
2. GET https://registry.npmjs.org/node-fetch
3. Set `Accept-Encoding` to `br` (or `gzip`);
4. Send.

What did you expect to happen?

So, we might see a Response Size of 136KB, but in reality, it's only munching up about 44KB in Network Size because of compression. Just thought it'd be cool to show that compressed size in our Network Size metric for a clearer picture of what's really going on!

Platform

None

HTTPie Desktop version

2022.5.1

Relevant log output

No response

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