[BUG] Some generated alerts are not correctly JSON-formatted

[frikilax]

Describe the bug
Sometimes, alerts are generated with fields containing non-escaped quotes, invalidating json formatting.
This behaviour has been observed with the Hostlookup filter, but is not limited to this one.

Plateform (please complete the following information):

• OS (version): Vulture4 (HBSD 12.2)
• Darwin version: 1.3.1

To Reproduce
Steps to reproduce the behavior:

1. Setup a database for a Hostlookup filter, with a result containing escaped quotes (for example "these \\"are\\" quotes")
2. Start the Hostlookup filter
3. trigger an alert by sending the corresponding index for the value with quotes
4. Look at the alert generated: it should contain the quotes unescaped

Expected behavior
Quotes in fields (at least in alerts) should be safely quoted to avoid breaking JSON formatting

Screenshots/logs
example of generated alert with broken formatting (description field) :
{"alert_type": "darwin", "alert_subtype": "hostlookup", "alert_time": "2021-02-02T18:44:42Z", "level": "high", "rule_name": "Lookup: public-domain", "tags": [], "entry": "suspicious-domain.org", "score": 100, "evt_id": "8ac22379-994c-462b-9370-1ef6e6bc18d3", "details": {"feed_name": "public-domain", "description": "[ "drop_hosts" ]"}}

Additional context
need to use std::quoted() in all fields with potential quotes