Breaking changes due to param ordering

[jarekwg]

Changing ordering of signature params like this is a surefire recipe for disaster:
https://github.com/XeroAPI/xero-python/blame/master/xero_python/accounting/models/contacts.py#L36

Introduced in 25a6d3e:

Where Contacts([Contact(...)]) would before create a Contacts instance with a single Contact, it now assigns that list to pagination...

That's a breaking change that's hard for consumers to track.

Recommendation: disallow positional params, require kwargs only:

def __init__(self, pagination=None, contacts=None):

->

def __init__(self, *, pagination=None, contacts=None):

[github-actions]

PETOSS-496

[github-actions]

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