Implement CreatePreservationTasks with CreateBulk

[sevein]

This PR explores a new pattern for handling bulk database operations using Go 1.23's range-over-function feature. It introduces a new CreatePreservationTasks method in the persistence package, which accepts a generator of preservation tasks (iter.Seq[*datatype.PreservationTask]). The method utilizes the batch function to group tasks into manageable batches and leverages CreateBulk to perform efficient bulk inserts in a single INSERT operation.

To view the main idea of this proposal in isolation, visit: https://go.dev/play/p/y7tYvD7NO28.

In future PRs, this new function could be used in areas like CreateAIPActivity and JobTracker to improve bulk task creation.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.64103% with 19 lines in your changes missing coverage. Please review.

Project coverage is 54.64%. Comparing base (c0afd76) to head (25f1c7e).

Files with missing lines	Patch %	Lines
internal/persistence/telemetry.go	0.00%	10 Missing :warning:
...ternal/persistence/ent/client/preservation_task.go	88.88%	3 Missing and 3 partials :warning:
internal/persistence/ent/client/batch.go	78.57%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1048 +/- ## ========================================== - Coverage 54.68% 54.64% -0.05% ========================================== Files 104 105 +1 Lines 7631 7683 +52 ========================================== + Hits 4173 4198 +25 - Misses 3201 3221 +20 - Partials 257 264 +7 ```

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[jraddaoui]

Sorry for the late update @sevein. I took a quick look a while ago, really nice and good learnings! I think @djjuhasz is also looking at it and will do the actual code review.

[djjuhasz]

@djjuhasz yes, I've been looking at it and will provide feedback. I'm having a hard time wrapping my head around the iterator code flow.

[sevein]

I've been looking at it and will provide feedback. I'm having a hard time wrapping my head around the iterator code flow.

The syntax is a bit confusing :cry:... I found the docstring of the compiler's rangefunc package somewhat useful: https://github.com/golang/go/blob/master/src/cmd/compile/internal/rangefunc/rewrite.go.

There are a couple of areas where I'm unsure if I'm doing things correctly:

• Making CreatePreservationTasks accept an iterator seemed convenient because it allows the user to simply provide a function that yields objects, without having to worry about chunking at all. I'm thinking in savePreservationTasks, you'd only need to write a function that walks the slice of a3m jobs and produces preservation tasks or use some kind of map & transform helper like this. It seems a better option if compared with accepting a slice I think?
• batch accepts and returns an iterator which is a pattern I haven't seen a lot in other projects, e.g. pkg.go.dev/slices has functions where they either accept or return an iterator but not both. But I've found at least one example: ChunkToSlices.

I haven't found yet an implementation like this in other codebases, I should probably look around more. I assume other poeple are also trying to solve the problem of ublk inserts with iterators? A project that is slightly related is https://github.com/achille-roussel/sqlrange.