rpk debug bundle should implement redaction rules for sensitive info

[mattschumpert]

Sensitive info collected by the diagnostic bundle such as configs in redpanda.yaml, IPs in the DNS info, names of Consumer Groups in the 'topic metadata' section should be redact-able with configurable redaction rules before being zipped.

[twmb]

The only way to be forward compatible with redacting sensitive information is to either:

• strip the Other map, which has arbitrary information that we cannot vet,
• specifically copy which fields we want to send (allowlist only)
• do not send the config file at all