Add Camera Focus Mode (#2180)

## Description
 
Camera focus tool pipeline using a Laplacian and finding the variance.
Similar to Limelight.


closes #1597 

## Meta

Merge checklist:
- [x] Pull Request title is [short, imperative
summary](https://cbea.ms/git-commit/) of proposed changes
- [x] The description documents the _what_ and _why_
- [x] This PR has been
[linted](https://docs.photonvision.org/en/latest/docs/contributing/linting.html).
- [x] If this PR changes behavior or adds a feature, user documentation
is updated
- [ ] If this PR touches photon-serde, all messages have been
regenerated and hashes have not changed unexpectedly
- [ ] If this PR touches configuration, this is backwards compatible
with settings back to v2025.3.2
- [x] If this PR touches pipeline settings or anything related to data
exchange, the frontend typing is updated
- [ ] If this PR addresses a bug, a regression test for it is added

photon-client/src/types/PhotonTrackingTypes.ts

@@ -70,6 +70,8 @@ export interface PipelineResult {
   sequenceID: number;
   fps: number;
   latency: number;
+  // Focus pipeline
+  focus?: number;
   targets: PhotonTarget[];
   // undefined if multitag failed or non-tag pipeline
   multitagResult?: MultitagResult;

photon-client/src/types/WebsocketDataTypes.ts

@@ -110,6 +110,7 @@ export interface IncomingWebsocketData {
 }
 
 export enum WebsocketPipelineType {
+  FocusCamera = -3,
   Calib3d = -2,
   DriverMode = -1,
   Reflective = 0,