feat(IAM): Add inline policies checks and improve custom policy checks

[puchy22]

Context

This PR is due to #3833

There are some checks related to custom policies that should be covered with inline policies too.

Description

Added new inline checks and changed custom checks to reuse functions inside new checks. The new checks are:

• iam_policy_no_full_access_to_cloudtrail
• iam_policy_no_full_access_to_kms
• iam_policy_allows_privilege_escalation

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 94.41341% with 10 lines in your changes missing coverage. Please review.

Project coverage is 86.71%. Comparing base (6fec855) to head (7300463).
Report is 18 commits behind head on master.

Files	Patch %	Lines
...iders/aws/services/iam/lib/privilege_escalation.py	89.85%	7 Missing ⚠️
prowler/providers/aws/services/iam/lib/policy.py	92.59%	2 Missing ⚠️
...n/iam_inline_policy_allows_privilege_escalation.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4255      +/-   ##
==========================================
+ Coverage   86.65%   86.71%   +0.06%     
==========================================
  Files         818      822       +4     
  Lines       25703    25806     +103     
==========================================
+ Hits        22272    22378     +106     
+ Misses       3431     3428       -3     

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