Set the initial capacity of ArrayLists in getAllUnreadResults() (#2079)

If there are more than 10 queued results,
PhotonCamera.getAllUnreadResults() would resize two arrays at least once
each.

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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_
- [ ] 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 v2024.3.1
- [ ] 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-targeting/src/main/java/org/photonvision/common/networktables/PacketSubscriber.java

@@ -101,11 +101,10 @@ public class PacketSubscriber<T> implements AutoCloseable {
     }
 
     public List<PacketResult<T>> getAllChanges() {
-        List<PacketResult<T>> ret = new ArrayList<>();
-
         // Get /all/ changes since last call to readQueue
         var changes = subscriber.readQueue();
 
+        List<PacketResult<T>> ret = new ArrayList<>(changes.length);
         for (var change : changes) {
             ret.add(parse(change.value, change.timestamp));
         }