feat(eslint-plugin): [member-ordering] allow easy reuse of the default ordering

[parloti]

PR Checklist

• Addresses an existing open issue: fixes Enhancement: member-ordering default configuration #5452
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

This PR allows to customize the member-ordering rule, while maintaining the default member groups without having to copy and paste more than 100 lines of code.
The PR changes the way that the default settings is specified by causing these to be merged with the custom settings rather than replaced.

[typescript-eslint]

Thanks for the PR, @parloti!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[bradzacher]

thanks for doing this!