feat(type-safe-api): expose managed rule props to allow consumers to …

[mirgj]

Fixes # NA

This PR introduce the ability to modify the Waf managed rule set provided by the consumers in order to allow customisations that include, for example, the ability to change the individual rule behaviour inside a ruleset.

A common example is related to the AWSManagedRulesCommonRuleSet which has a strict rule named SizeRestrictions_BODY that allow only 8Kb body payload. With the current implementation provided by PDK the only option we have is to either disable Waf altogether or add a different rule set to override the default behaviour. The interface provided by type safe api doesn't provide the ability to modify the ruleset rules.

With this change, consumers can override individual rules in the ruleset as the entire CDK interface is shared to the consumer.

In order to have backwards compatibility this PR keep the usage of both vendor and vendorName properties. In future PDK iterations it's suggested to remove vendor to keep only vendorName using the default interface provided by CDK

[cogwirrel]

Looks great, thank you! Just a couple of minor nit-picks :)