Add `AllowUnknownEnumValues` setting to add option to disable enumeration validation

[INeedMySpace]

When testing messages from market unknown enum value in messages lead to validation exception, e.g.
if PartyRole has value that is not represented in FIX.xml

<field number="452" name="PartyRole" type="INT">
      <value enum="1" description="EXECUTING_FIRM"/>
      <value enum="2" description="BROKER_OF_CREDIT"/>
      <value enum="3" description="CLIENT_ID"/>

Rejecting invalid message: quickfix.IncorrectTagValue: Value is incorrect (out of range) for this tag, field=452 field=452:
Please introduce settings parameter which could allow such values.

Similar feature implemented in QuickFixN - connamara/quickfixn#929

Thanks in advance.

[chrjohn]

As a workaround: set allowOtherValues in the dictionary, e.g.

<field number="65" name="SymbolSfx" type="STRING" allowOtherValues="true">

BTW, we welcome pull requests. 😄

[konradbloor]

Hi @INeedMySpace @chrjohn I saw this and took the liberty of submitting a PR - #1303 - obviously happy to improve it if there are deficiencies 🙏 😄