Update Rust model with list of time zones

[richfab]

Follow-up of #146

Context

The time zones in the schemas were replaced with the content of the TZ identifier column from this list.

Problem

The Rust models are inconsistent with the spec because they use the previous list of time zones.

Solution

Update the Rust models with the list of time zones from the schemas.

[Alessandro100]

Looking at the current files, timezone is defined as
pub type Timezone = String;
Which has a comment mentioning that the values should be according to the link https://en.wikipedia.org/wiki/List_of_tz_zones. This link redirects to the correct list of new Timezones

Unless we want to change the data type from String to something more complex, there is nothing to be done here and can close the ticket

[richfab]

Got it, thank you for looking into it @Alessandro100.

In theory, the model should match the spec and only allow values ​​from the list https://en.wikipedia.org/wiki/List_of_tz_zones.

What do you think @tdelmas as the author and user of this model?

[tdelmas]

As they should use the current valid timezone, I think updating the list is the correct way.

[richfab]

Thank you @tdelmas!

@Alessandro100 If it's a quick thing to do, please add the allowed values ​​from the list https://en.wikipedia.org/wiki/List_of_tz_zones.

If it's not quick to do, then please reassess the priority of this issue with @emmambd and @davidgamez. Thank you!