Add tun proxy mode on Linux (#7278)

* simplify stream handling callback

* add `tun` proxy mode from mitmproxy_rs

* tun mode: tests++

* [autofix.ci] apply automated fixes

* bump mitmproxy_rs

* fix bugs

* ci: use macOS 13 for builds as 12 is being phased out

* test debugging

* bump mitmproxy_rs

* bump python version in ci, 3.13 is stable now

* nits

* is unshare to blame?

* how about this?

* coverage++

* [autofix.ci] apply automated fixes

* debüg

* debüüg

* debüüüg

* bump mitmproxy_rs

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

.github/workflows/main.yml

@@ -44,11 +44,11 @@ jobs:
       matrix:
         include:
           - os: ubuntu-latest
-            py: "3.13-dev"
+            py: "3.13"
           - os: windows-latest
-            py: "3.13-dev"
+            py: "3.13"
           - os: macos-latest
-            py: "3.13-dev"
+            py: "3.13"
           - os: ubuntu-latest
             py: "3.12"
           - os: ubuntu-latest
@@ -100,7 +100,7 @@ jobs:
         include:
           - image: macos-14
             platform: macos-arm64
-          - image: macos-12
+          - image: macos-13
             platform: macos-x86_64
           - image: windows-2019
             platform: windows