Support selecting Object Detection models (#1359)

This PR is for part 1 of #1354. It focuses on adding a model selection
interface for models that exist in `photonvision_config/models/`. Upon
completion we can ship more than 1 model and users could upload their
own through `ssh` without deleting the shipped model. This PR also adds
the abstractions need to support more DNN backends (say OpenCV, or RPI
AI Kit)

Up next is adding a CRUD interface for managing models through the UI.

photon-client/src/stores/settings/GeneralSettingsStore.ts

@@ -28,7 +28,8 @@ export const useSettingsStore = defineStore("settings", {
       hardwareModel: undefined,
       hardwarePlatform: undefined,
       mrCalWorking: true,
-      rknnSupported: false
+      availableModels: {},
+      supportedBackends: []
     },
     network: {
       ntServerAddress: "",
@@ -105,7 +106,8 @@ export const useSettingsStore = defineStore("settings", {
         hardwarePlatform: data.general.hardwarePlatform || undefined,
         gpuAcceleration: data.general.gpuAcceleration || undefined,
         mrCalWorking: data.general.mrCalWorking,
-        rknnSupported: data.general.rknnSupported
+        availableModels: data.general.availableModels || undefined,
+        supportedBackends: data.general.supportedBackends || []
       };
       this.lighting = data.lighting;
       this.network = data.networkSettings;