[FP][17.0][WIP] [IMP] web_timeline - support multiple group-by levels and allow to group by m2m field

[cuongnmtm]

Test cases:

• [ ] group by one field (group by m2o, selection, integer, m2m, date, ...)
• [ ] group by multiple fields
• [ ] group by 0 field: back to default group by
• [ ] create a new record
• [ ] drag and drop record to update
• [ ] click on the group by to view the group by record detail
• [ ] when group by m2m field, record is displayed multiple times if linked to multiple m2m records
• [ ] when drag and drop, the value of the m2m field should not be updated as there is no best way to handle this
• [ ] when creating a new record, set the default value for all grouped fields
• [ ] handle group by non-relation fields: click on the group of selection or char field do not popup record form view to avoid error.
• [ ] dependency_arrow between multiple collapse/expand groups

[OCA-git-bot]

Hi @tarteo, some modules you are maintaining are being modified, check this out!

[carlos-lopez-tecnativa]

@cuongnmtm I understand this PR is not ready for review yet because the files are not loaded in the manifest. Additionally, you must convert them to .esm.js and odoo-module according to this commit made during the migration to 17.0: https://github.com/OCA/web/commit/43341291dd0a61875fb4e45e75baff096420ac5e

[cuongnmtm]

I got this error when grouping a datetime field. I suspect this commit 751fb9c might be missing, please review:

I haven't finished this port yet. There are three commits to port, and the remaining two are taking more time because I need to adapt the changes to the refactoring in version 17. I will find time to work on them.