refactor(bundler): remove unused fs utils, add http utils

[FabianLars]

not done yet, just checking if it still compiles in ci

[github-actions]

Package Changes Through 9e484f8

There are 7 changes which include tauri-bundler with minor, tauri-cli with minor, @tauri-apps/cli with minor, tauri with minor, tauri-runtime with minor, tauri-runtime-wry with minor, tauri-utils with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tauri-utils	2.1.0	2.1.1
tauri-bundler	2.1.0	2.2.0
tauri-runtime	2.2.0	2.3.0
tauri-runtime-wry	2.2.0	2.3.0
tauri-codegen	2.0.3	2.0.4
tauri-macros	2.0.3	2.0.4
tauri-plugin	2.0.3	2.0.4
tauri-build	2.0.3	2.0.4
tauri	2.1.1	2.2.0
@tauri-apps/cli	2.1.0	2.2.0
tauri-cli	2.1.0	2.2.0

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[FabianLars]

the reason for this pr was that i needed to re-use the windows download functions (including the github mirror handling) in a small linux refactor (getting rid of build-appimage.sh) and while looking into it i noticed that we had 2 fs helper modules with duplicate functionality.