[2.3.0] Checkmk Werk 16619 created: Ruleset API: Ruleset validation

[//]: # (werk v2) # Ruleset API: Ruleset validation key | value ---------- | --- date | 2024-03-11T12:46:16+00:00 version | 2.3.0b3 class | fix edition | cre component | checks level | 1 compatible | no Rulespec/ruleset names now have to be valid [python identifiers](https://docs.python.org/3/reference/lexical_analysis.html#iden…. The validation occurs during instantiation and will raise a `ValueError` when a violation is found.