[16.0][FIX] base_import_async: use chunk size defined by user in front when creating import batches

[AnizR]

Goal

Define the chunk size when importing in background

Context

When realizing big import, we have the option to define batch sizes for import (feature from odoo's base_import):

But, I realized that base_import_async wasn't using this field and so, it does only batches of 100 records (default value).
This field is set as options["limit"] by odoo's front (in .js). Therefore, I have updated the OPT_CHUNK_SIZE because "chunk_size" is never defined.

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖

[sbidoul]

Looks good. Thanks!

/ocabot merge patch

[OCA-git-bot]

On my way to merge this fine PR!
Prepared branch 16.0-ocabot-merge-pr-878-by-sbidoul-bump-patch, awaiting test results.

[OCA-git-bot]

@sbidoul The merge process could not be finalized, because command git push origin 16.0-ocabot-merge-pr-878-by-sbidoul-bump-patch:16.0 failed with output:

To https://github.com/OCA/queue
 ! [rejected]          16.0-ocabot-merge-pr-878-by-sbidoul-bump-patch -> 16.0 (fetch first)
error: failed to push some refs to 'https://github.com/OCA/queue'
hint: Updates were rejected because the remote contains work that you do not
hint: have locally. This is usually caused by another repository pushing to
hint: the same ref. If you want to integrate the remote changes, use
hint: 'git pull' before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

[OCA-git-bot]

Congratulations, your PR was merged at 545c5bc. Thanks a lot for contributing to OCA. ❤️