Fix WAF log parsing when there are multiple dicts in one line

[Selutario]

Related issue
Closes #9526

Description

Due to the way the WAF integration is currently designed, in case there was more than one dictionary in a single line (stored in the S3 bucket from which they have to be extracted), an error would occur when using json.loads() since that format is invalid:

wazuh/wodles/aws/aws_s3.py

Lines 2079 to 2092 in af255be

	def load_information_from_file(self, log_key):
	"""Load data from a WAF log file."""
	content = []
	with self.decompress_file(log_key=log_key) as f:
	for line in f.readlines():
	try:
	event = json.loads(line.rstrip())
	except json.JSONDecodeError:
	print("ERROR: Events from {} file could not be loaded.".format(log_key.split('/')[-1]))
	sys.exit(9)
	event['source'] = 'waf'
	content.append(event)
	return json.loads(json.dumps(content))

This PR updates said part of the code so that, using raw_decoder, each line is divided into several dictionaries (if there are more than one per line). Therefore, now the following content would be valid, unlike what happened previously:

{"dict_1_key": "value", "dict_1_key2": "value"}
{"dict_2_key": "value", "dict_2_key2": "value"}{"dict_3_key": "value", "dict_3_key2": "value"}{"dict_4_key": "value", "dict_4_key2": "value"}
{"dict_5_key": "value", "dict_5_key2": "value"}
{"dict_6_key": "value", "dict_6_key2": "value"}

This change does not break previous functionality, it simply increases the flexibility of the WAF integration.

WAF log files

Part of the issue requested reviewing the WAF logs that we used for our developments. After doing so, I have been able to verify that they are not correct since they do not correspond to the information that said tool throws up. Here is an example of the logs we had:

{"ticker_symbol":"AZL","sector":"HEALTHCARE","change":-0.2,"price":17.47}{"ticker_symbol":"WAS","sector":"RETAIL","change":-0.43,"price":12.08}{"ticker_symbol":"KFU","sector":"ENERGY","change":3.29,"price":45.26}

To speed up the process, I have decided to add the logs that appear in the WAF documentation instead of generating our own:

{
    "timestamp":1592357192516
    ,"formatVersion":1
    ,"webaclId":"arn:aws:wafv2:us-east-1:123456789012:global/webacl/hello-world/5933d6d9-9dde-js82-v8aw-9ck28nv9"
    ,"terminatingRuleId":"Default_Action"
    ,"terminatingRuleType":"REGULAR"
    ,"action":"ALLOW"
    ,"terminatingRuleMatchDetails":[]
    ,"httpSourceName":"-"
    ,"httpSourceId":"-"
    ,"ruleGroupList":[]
    ,"rateBasedRuleList":[]
    ,"nonTerminatingMatchingRules":
    [{
        "ruleId":"TestRule"
        ,"action":"COUNT"
        ,"ruleMatchDetails":
        [{
            "conditionType":"SQL_INJECTION"
            ,"location":"HEADER"
            ,"matchedData":[
                "10"
                ,"and"
                ,"1"]
            }]
    }]
    ,"httpRequest":{
        "clientIp":"3.3.3.3"
        ,"country":"US"
        ,"headers":[
            {"name":"Host","value":"localhost:1989"}
            ,{"name":"User-Agent","value":"curl/7.61.1"}
            ,{"name":"Accept","value":"*/*"}
            ,{"name":"foo","value":"10 AND 1=1"}
            ]
            ,"uri":"/foo","args":""
            ,"httpVersion":"HTTP/1.1"
            ,"httpMethod":"GET"
            ,"requestId":"rid"
    },
    "labels": [
        {
            "name": "value"
        }
    ]
}

Regards.