Add support for weeks

Hi @dww
I have another approach to this since PHP DateInterval does not natively support weeks I do not change any DataTypes to make them represent true php iso standards and not be some mess with ifs.
Instead I have added another column for weeks to store alondside and added getValue() method to field so duration and seconds are adjusted to have those weeks included.
I have also reviewed test since they are running badly on D10, fixed field creation and removed deprecated code.

- Upgrading drupal/duration_field (dev-2.x cdf331a => dev-2.x 20674f7): Checking out 20674f7714 from cache

This commit causes:

[error] Cannot add field 'node__field_duration_hms.field_duration_hms_weeks': field already exists.

... when updating 2.0 dev from previous 2.0 dev and this breaks the site if it is part of a project update process since non of the required db updates can run being interrupted by this error.

Glad that I found my own report/comment here because I was falling into the same trap again ...

sickness29 → closed merge request !17

Hi @dqd
this should now be fixed on latest dev version

Automatically closed - issue fixed for 2 weeks with no activity.

It may make sense to drop months in favor of weeks only because a month is the only duration option that is not consistently the same and could lead to bad assumptions and potential end user confusion since we're always converting into seconds.