This commit parameterises all methods in the send view so that they can send
either emails or SMS messages.
It works out what kind of message it is sending from the `template_type`
property of the template object.
This means that the `Template` util class needs to know about these properties,
which means that this commit depends on:
https://github.com/alphagov/notifications-utils/pull/2
This commit does _not_ add tests for sending emails. The existing tests for
sending SMS still pass, but actually sending emails is outside the scope of
this story.
This commit extends the existing function to validate each row’s phone number
to also validate that all the required data is present.
It does this using the checking that the `Template` class can do when given
a template and a `dict` of values.
