the WF engine should resolves escaped variables

[FabienArcellier]

The WF engine no longer resolves escaped variables @{a\.b} to point to a state encoded with a . as a separator:

state = wf.init_state({
    "a.b": 2,
})

---

feature	status
the engine resolve the escape variable in text field	KO
the engine resolve the escape binding	KO
the autocompletion handle escape on "a.b"	KO
the state explorer show the variable	OK
WriterState should support field mapping to handle dot notation	KO

WriterState should support field mapping to handle dot notation

class MyState(wf.WriterState):
    counterA: int = wf.field(key='counter.a', default=0)
    counterB: int = wf.field(key='counter.b', default=0)

    @wf.property(['counter\.a', 'counter\.b'])
    # alternative : @wf.property(['counterA', 'counterB'])
    def counter_sum(self) -> int:
        return self.counterA + self.counterB # equivalent of self['counter.a'] + self['counter.b']

[FabienArcellier]

implement in #568

[FabienArcellier]

it's available in release 0.8.1