[IMP] core: deprecate returning domains from onchanges

* add a runtime warning when an onchange method contains the string
  'domain'
* add a lint test to forbid the string 'domain' in onchange methods,
  this is easy to defeat (e.g. `dict(domain=...)`) and can have false
  positives (literal `'domain'` strings for reasons other than an
  onchange result) but overall it seems to work nicely
* implemented as a non-pylint test as pylint takes ages to run. While
  at it, remove the long-disabled and long-useless
  PEP3110TokenChecker (checks for `except Exception, a` which is a
  syntax error in P3)

Task 2115472

closes odoo/odoo#41918

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

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