feat: Surface patch file size in `shorebird_code_push` package

[tomarra]

Description

This is a tracking issue from a customer email.

We have a requirement to obtain the patch download size (in bytes/KB/MB) once the download is completed, so that we can report this data to our internal logging system.

We do have a few ways to get this information currently:

• At patch creation time, size of each patch (by platform) is listed in the CLI
• In the Web Console you can see the size of each patch by hovering over the CPU architecture for each patch

But this information is currently not available on device which is typically where analytics/logging is happening.

Requirements

• The changes for this are reflected in the shorebird_code_push package
• The user has the ability to get the size of the patch that was downloaded
• The user has the ability to get the size of the inflated patch on disk

Additional Context

None

[bryanoltman]

package:shorebird_code_push is probably the wrong place to do this—these file sizes are all available to us when the shorebird patch command is being run and don't change between then and when the patch is being downloaded/inflated on an end user's device. If there's a desire to collect this data, that would be the right place to do it.

[tomarra]

Fair. I think we need to get some clarification on the use case. The way that I read the feedback is that they are attempting to track the amount of bandwidth their app is causing on device so it needs to be reported from there. If thats not the case then your probably correct.