feat: 🎉 Adding TidyDNS provider

[langecode]

What does it do ?

Motivation

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[gemini-code-assist]

Summary of Changes

Hello @langecode, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly extends the capabilities of external-dns by introducing support for TidyDNS as a new DNS provider. This integration allows users to leverage external-dns to automatically manage DNS records within their TidyDNS environment, configuring it via a new command-line flag for the service endpoint and environment variables for authentication. The changes encompass the full lifecycle of DNS record management (create, update, delete) for common record types, ensuring robust and tested functionality.

Highlights

• TidyDNS Provider Integration: A new DNS provider, TidyDNS, has been added, enabling external-dns to manage DNS records via TidyDNS services.
• Configuration Options: The "--tidydns-endpoint" flag is introduced for specifying the TidyDNS service endpoint, along with environment variable support for authentication credentials ("TIDYDNS_USER", "TIDYDNS_PASS").
• Core Logic Implementation: The "tidydns" package includes the "TidyDNSProvider" implementation, handling record listing ("Records") and applying changes ("ApplyChanges") for A, CNAME, and TXT record types.
• Dependency Management: The "go.mod" and "go.sum" files have been updated to include the "github.com/neticdk/tidydns-go" client library.
• Documentation and Testing: The "docs/flags.md" file is updated to reflect the new provider and its configuration, and comprehensive unit tests are provided for the TidyDNS provider logic.

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[gemini-code-assist]

Code Review

This pull request introduces the TidyDNS provider, integrating it into ExternalDNS. The changes include adding the necessary Go module dependencies, updating configuration structures and flag bindings, and implementing the core provider logic along with its unit tests. The overall structure follows existing provider patterns within the project, which is good. However, there are a few areas that require attention to ensure correctness and robustness, particularly concerning the handling of TXT records and the update logic for existing records.