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/types/PipelineTypes.ts

@@ -289,6 +289,7 @@ export interface ObjectDetectionPipelineSettings extends PipelineSettings {
   confidence: number;
   nms: number;
   box_thresh: number;
+  model: string;
 }
 export type ConfigurableObjectDetectionPipelineSettings = Partial<
   Omit<ObjectDetectionPipelineSettings, "pipelineType">
@@ -304,7 +305,8 @@ export const DefaultObjectDetectionPipelineSettings: ObjectDetectionPipelineSett
   cameraExposureRaw: 6,
   confidence: 0.9,
   nms: 0.45,
-  box_thresh: 0.25
+  box_thresh: 0.25,
+  model: ""
 };
 
 export type ActivePipelineSettings =

photon-client/src/types/SettingTypes.ts

@@ -7,7 +7,8 @@ export interface GeneralSettings {
   hardwareModel?: string;
   hardwarePlatform?: string;
   mrCalWorking: boolean;
-  rknnSupported: boolean;
+  availableModels: Record<string, string[]>;
+  supportedBackends: string[];
 }
 
 export interface MetricData {