[ruby/resolv] Implement CAA resource record

This patch implements handling of CAA resource records defined by [RFC8659].

- There are no known deployment of CAA records outside of IN (Internet),
  but the RFC does not state that CAA records are class-specific.
  Thus `CAA` class is defined as a class-independent RRType.
- `CAA` class stores `flags` field (a 1-octet bitset) as an Integer.
  In this way it's easier to ensure the encoded RR is in the valid wire format.

[RFC8659]: https://datatracker.ietf.org/doc/html/rfc8659

https://github.com/ruby/resolv/commit/cfc4de75e3

Co-authored-by: aeris <aeris@imirhil.fr>

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