refactor(core): Remove unused direct-decode in JSON decodeFields
refactor(core): Remove unused direct-decode in JSON decodeFields

jpfr/open62541,jpfr/open62541,JGrothoff/open62541,jpfr/open62541,JGrothoff/open62541,open62541/open62541,JGrothoff/open62541,open62541/open62541,open62541/open62541,JGrothoff/open62541,jpfr/open62541,open62541/open62541