feat(mobile): native clients (#21459)

* platform clients

* uppercase http method

* fix hot reload

* custom user agent

* init before app launch

* set defaults

* move to bootstrap

* unrelated change

* disable disk cache by default

* optimized decoding

* remove incremental

* android impl

* memory optimization

* lock approach is slower on ios

* conditional cronet

* clarify parameter

* enable disk cache

* set user agent

* flutter-side decode

* optimized http

* fixed locking

* refactor

* potential race conditions

* embedded cronet

* refactor, fix capacity handling

* fast path for known content length

* ios optimizations

* re-enable cache

* formatting

* bump concurrency

* clear cache button

* fix eviction race condition

* add extra cancellation check

* tighten dispose

* better error handling

* fix disposal

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

i18n/en.json

@@ -451,6 +451,9 @@
   "admin_password": "Admin Password",
   "administration": "Administration",
   "advanced": "Advanced",
+  "advanced_settings_clear_image_cache": "Clear Image Cache",
+  "advanced_settings_clear_image_cache_error": "Failed to clear image cache",
+  "advanced_settings_clear_image_cache_success": "Successfully cleared {size}",
   "advanced_settings_enable_alternate_media_filter_subtitle": "Use this option to filter media during sync based on alternate criteria. Only try this if you have issues with the app detecting all albums.",
   "advanced_settings_enable_alternate_media_filter_title": "[EXPERIMENTAL] Use alternate device album sync filter",
   "advanced_settings_log_level_title": "Log level: {level}",