[IMP] base: cleanup action handlers a bit

* code *must* have an eval_context, `None` would blow up as soon as it
  looks for the `'action'` key
* [accidentally quadratic] eval_value returns a value per line, seems
  silly to evaluate all lines for each line when we can evaluate all of
  them once, then map results to field names
* eval_value doesn't break inside the loop, so every id gets a value
  by construction, `dict.fromkeys` is completely unnecessary (and
  provides no performance benefits)

closes odoo/odoo#53110

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

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