Refactor `TunConfig` and `TalpidVpnService` and fix duplicate tun configuration #13003

Job	Run time
Prepare	6s
Build native (x86_64, x86_64, x86_64-linux-android)	3m 50s
Build native (i686, x86, i686-linux-android)	3m 59s
Generate debug keystore	6s
Build native (aarch64, arm64-v8a, aarch64-linux-android)	4m 8s
Run lint and test tasks (testDebugUnitTest -x :test:arch:testDebugUnitTest :app:testOssProdDebugU...	3m 31s
Build native (armv7, armeabi-v7a, armv7-linux-androideabi)	4m 0s
Run lint and test tasks (:test:arch:test --rerun-tasks)	3m 23s
Generate relay list	1m 8s
Run lint and test tasks (detekt)	2m 59s
Run lint and test tasks (lint)	3m 53s
Build instrumented test packages (app, assembleOssProdAndroidTest, android/app/build/outputs/apk)	4m 41s
Build instrumented test packages (mockapi, :test:mockapi:assemble, android/test/mockapi/build/out...	4m 33s
Build instrumented test packages (e2e, :test:e2e:assemble, android/test/e2e/build/outputs/apk)	4m 30s
Build app	3m 39s
Run instrumented tests	0s
Run firebase tests	0s
Run instrumented e2e tests	0s
	48m 26s

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