TextFilterField: enable access to "converterType" property

Goal:
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Enable custom converter usage for a ContainerFilterComponent's main TextFilterField.

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Current situation:
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It is possible to set a converter (here a custom "FilterConverter") by

But the converter is not used, as the method does not set the "converterType":
(From "TextFilterField"):

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Suggested changes:
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[ Enable access to "converterType" >> consultation required ]

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Comment:
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