remove autocast feature

[AlvaroVega]

Autocast feature is currently doing unexpected and unwanted transformations which could be done by jexl in a controlled way, so it must be fully removed.

Maybe related with #1037

iotagent-node-lib/lib/services/ngsi/ngsiUtils.js

Lines 98 to 134 in 9dc0657

	function castJsonNativeAttributes(payload) {
	if (!config.getConfig().autocast) {
	return payload;
	}
	for (const key in payload) {
	if (
	/* eslint-disable-next-line no-prototype-builtins */
	payload.hasOwnProperty(key) &&
	payload[key].value &&
	payload[key].type &&
	typeof payload[key].value === 'string'
	) {
	if (payload[key].type === 'Number' && isFloat(payload[key].value)) {
	payload[key].value = Number.parseFloat(payload[key].value);
	} else if (payload[key].type === 'Number' && Number.parseInt(payload[key].value)) {
	payload[key].value = Number.parseInt(payload[key].value);
	} else if (payload[key].type === 'Boolean') {
	payload[key].value = payload[key].value === 'true' || payload[key].value === '1';
	} else if (payload[key].type === 'None') {
	payload[key].value = null;
	} else if (payload[key].type === 'Array' || payload[key].type === 'Object') {
	try {
	const parsedValue = JSON.parse(payload[key].value);
	payload[key].value = parsedValue;
	} catch (e) {
	logger.error(
	context,
	'Bad attribute value type. Expecting JSON Array or JSON Object. Received:%s',
	payload[key].value
	);
	}
	}
	}
	}
	return payload;
	}

[AlvaroVega]

Alternativally autocast could be reimplemented with just:

try {
  value = JSON.parse(value);
} catch (e) {
   // keep value as 
}

[mrutid]

We are losing the autocast for the case:
1->true
Which still avaliable via JEXL explicit casting.

[fgalan]

Fixed by PR #1324