[IMP] mail: add computed fields for company emails

Purpose of this commit is to give a way to access to company email and catchall
with formatting. Those will be used in various automated emails. Indeed
currently several templates use either ``company_id.partner_id.email``,
``company_id.email``, or even don't provide fallback values.

With this commit from a company record people will be able to use

  * a correctly formatted catchall: ``"My Company Name"
    <catchall_alias@catchall_domain>``
  * an email_formatted field like partner email_formatted that is either its
    partner-related email_formatted value, or formatted catchall if its partner
    is not correctly configured;

Various calls to mail creation are updated accordingly.

Task ID 1853147
PR #32243