Implement libdnstest-based tests and fix related issues #289
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This PR adds Route53-specific tests using the new libdnstest package, which is now part of libdns (alpha)
Additionally it fixes multiple bugs discovered during testing.
The main issue was Route53's ResourceRecordSet model - it groups records by name+type, while libdns treats each record individually. Fixed by rewriting AppendRecords and DeleteRecords to properly handle grouping.
Other fixes:
Testing now covers all DNS record types. Examples updated to use command-line arguments.
Updated libdns to v1.1.1 throughout. Tests currently rely on a custom go.mod in the libdnstest directory until the package is released in a stable version.