Add support for ignore rules

[ildyria]

Ignoring findings

It is possible to ignore some blocker findings (e.g. false positive) by providing
a resc-ignore.dsv file. The bockers will be downgraded to a warning level and marked as ignored. Such file has the following structure:

# This is a comment
finding_path|finding_rule|finding_line_number|expiration_date
finding_path_2|finding_rule_2|finding_line_number_2

• finding_path contains the path to the file with the blocking finding.
• finding_rule contains the name of the blocking rule.
• finding_line_number contains the line number of the finding.
• expiration_date is optional, contains the date in ISO 8601 format until which this ignore rule should be considered valid.

For example, if we want to ignore the finding in file /etc/passwd for rule root_value_found on line 1 until April 1st 2024 at 23:59 the following line should be used.

/etc/passwd|root_value_found|1|2024-04-01T23:59:00

To ignore this finding ad vitam aeternam:

/etc/passwd|root_value_found|1