Use errors and fmt package to join and wrap errors

[boekkooi-terramate]

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Good day!

First of thank you for maintaining and providing the watermill package!

I opened this PR because I noticed that the hashicorp/go-multierror and github.com/pkg/errors where added as an indirect dependency when using watermill. As these dependency have native alternatives I created this PR.

Since golang 1.20 the go errors package supports errors.Join which replaces the need for the hashicorp/go-multierror package which was providing the same functionality. To wrap errors fmt.Errorf with the %w format specifier (introduced in golang 1.13) is now used instead of errors.Wrap which was provided by the github.com/pkg/errors package.

Please let me know what you think and if any changes are needed. Have a great day and thank you for reviewing this PR!

Cheers, Warnar

This PR resolves https://github.com/ThreeDotsLabs/watermill/issues/447