This commit aims to improve the performance of
`_attendance_intervals_batch`.
The complexity in space has been reduced by a lot.
Prior to this commit an intervals object was generated for each resource
request.
However every resource of the same timezone will share the same ending result.
The number of calls to `localize` and `astimezone` has also been reduced
as they get quite expensive with such a high volume.
Overall we can see a 10x improvement during `test_performance_attendance_intervals_batch`
closesodoo/odoo#90933
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>
William Braeckman
df984fff4e