Refactor definitions

[devl00p]

This MR refactors the attributes of each definition, which were previously held as module constants, into separate classes named "findings".

Purpose:

• Enhanced Type Safety: By leveraging type hinting, functions like add_payload can now benefit from stronger data type enforcement.
• Attribute Completeness: The use of an abstract base class ensures that all required attributes are present for each finding, reducing the risk of omissions (linter will flag any missing attributes). Parameter Simplification: Encapsulating attributes within a single class instance reduces the number of parameters - required for functions like add_payload.
• Fixed Finding Types: Each finding class is assigned a specific type (vulnerability, anomaly, or additional), ensuring clarity and consistency.

• The severity of a finding is not encapsulated within the finding class itself, as it may vary depending on specific circumstances.

If a finding can be categorized as both a vulnerability and an additional type, separate finding classes should be created for each category.

[fwininger]

@bretfourbe peux tu regarder les implications pour nous.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.23374% with 77 lines in your changes missing coverage. Please review.

Project coverage is 80.40%. Comparing base (7e84c4c) to head (5ca9ce1). Report is 1 commits behind head on master.

Files	Patch %	Lines
wapitiCore/definitions/base.py	75.75%	8 Missing :warning:
wapitiCore/definitions/xpath.py	75.00%	6 Missing :warning:
wapitiCore/attack/mod_xxe.py	60.00%	4 Missing :warning:
wapitiCore/definitions/xxe.py	83.33%	4 Missing :warning:
wapitiCore/attack/mod_sql.py	62.50%	3 Missing :warning:
wapitiCore/definitions/http_headers.py	95.58%	3 Missing :warning:
wapitiCore/attack/mod_csp.py	33.33%	2 Missing :warning:
wapitiCore/attack/mod_exec.py	71.42%	2 Missing :warning:
wapitiCore/attack/mod_file.py	66.66%	2 Missing :warning:
wapitiCore/attack/mod_http_headers.py	60.00%	2 Missing :warning:
... and 39 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #606 +/- ## ========================================== + Coverage 79.61% 80.40% +0.78% ========================================== Files 123 124 +1 Lines 10431 11125 +694 ========================================== + Hits 8305 8945 +640 - Misses 2126 2180 +54 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[devl00p]

Another significant change: the HTTP headers definitions are now split into 3 separate findings:

• Clickjacking (tied to X-Frame-Options)
• MIME Type Confusion (tied to X-Content-Type-Options)
• HSTS (did not changed that one but we may consider renaming it to "Man in the middle" or something else)