add support for delivery_rules.RewriteResponse objects

Currently, when running `incap site list_incaprule `,
rules with the following action types are completely missing from all output.

- "action": "RULE_ACTION_RESPONSE_DELETE_HEADER"
- "action": "RULE_ACTION_RESPONSE_REWRITE_HEADER"

and possibly others?

Values are from APIv1 output `/api/prov/v1/sites/incapRules/list`, as well as listed here:

- https://docs.imperva.com/bundle/cloud-application-security/page/api/sites-api.htm#possible_action_parameter_values_for_delivery_rules:

Start with the `incap site list_incaprule ` command and inspect how results from `/api/prov/v1/sites/incapRules/list` are converted into output. Confirm how `RULE_ACTION_RESPONSE_DELETE_HEADER` and `RULE_ACTION_RESPONSE_REWRITE_HEADER` rules are currently handled, then verify that these rules appear in the command output.

Written by the indexing model from the issue text.