Add AfterChunk event for chunked exports

[sebestenyb]

fixes #3606

Add AfterChunk event for chunked exports

This PR allows the AfterChunk event to fire on chunked queued exports.

#3634

1️⃣ Why should it be added? What are the benefits of this change?

With this, it is possible to

• showing the progress to the user
• estimate time for an export

2️⃣ Does it contain multiple, unrelated changes? Please separate the PRs out.

No

3️⃣ Does it include tests, if possible?

No

4️⃣ Any drawbacks? Possible breaking changes?

No breaking changes.

5️⃣ Mark the following tasks as done:

• Checked the codebase to ensure that your feature doesn't already exist.
• Take note of the contributing guidelines.
• Checked the pull requests to ensure that another person hasn't already submitted a fix.
• Added tests to ensure against regression.

6️⃣ Thanks for contributing! 🙌

[patrickbrouwers]

Could you add a test for this event in https://github.com/SpartnerNL/Laravel-Excel/blob/3.1/tests/Concerns/WithEventsTest.php

[sebestenyb]

Could you add a test for this event in https://github.com/SpartnerNL/Laravel-Excel/blob/3.1/tests/Concerns/WithEventsTest.php

Hi, thanks for considering this PR. I have added a test, I hope this is how you wanted.
It was a bit tricky because this event was only raised from a queued context, so couldn't use closure based event handlers.

Cheers, Sebi

[sebestenyb]

Hi @patrickbrouwers, do you need anything else here?

[patrickbrouwers]

If we could create 2 users here,
Do a chunk export with chunk size 1

Then we could do an additional assert that the chunk event was raised twice, I think. Could you check if that's possible.

[patrickbrouwers]

Improved the test myself