OpenVAS Parser - parsing and deduplication improvments

[jostaub]

This changed updates the OpenVAS Parser to fix the issues described in #12378

Detailed changes:
General:

• Updated the CSV implementation to behave more like the XML parser.
• Introduced de-duplication using unique_id_from_tool to OpenVAS parser.
• Increased behavior consistency between the CSV and XML parsers.
• Combined findings where the only differences are in fields that can’t be reliably hashed due to inconsistent values between scans e.g timestamps.
• parser now combines multiple identical findings with different endpoints into one findings with multiple endpoints

CSV Parser:

• removed ip from description
• added qod to description

XML Parser:

• finding name no longer includes ip and protocol
• parser no longer appends extra information to the description (same description behavior as csv)
• severity now maps to cvss v3 score
• the description xml tag now maps to reference
• the summary inside the xml tag (part of nvt tag) now maps to description
• impact is now included in finding
• same qod behavior as csv parser

TODO:
[x] extract more information from xml
[] migration for OpenVAS parser
[] improve testing with better test files