enhance GitHub dispatcher

[junminahn]

We want to enhance the GitHub dispatcher logic to automatically determine the next tag version based on commit history if a tag is not provided by the GitHub UI:

1. Major – If a commit includes a breaking change
2. Minor – If a commit is of type feat
3. Patch – For all other commit types

Additional info: (https://www.conventionalcommits.org/en/v1.0.0/#summary)
The commit contains the following structural elements, to communicate intent to the consumers of your library:

• fix: a commit of the type fix patches a bug in your codebase (this correlates with PATCH in Semantic Versioning).

• feat: a commit of the type feat introduces a new feature to the codebase (this correlates with MINOR in Semantic Versioning).

• BREAKING CHANGE: a commit that has a footer BREAKING CHANGE:, or appends a ! after the type/scope, introduces a breaking API change (correlating with MAJOR in Semantic Versioning). A BREAKING CHANGE can be part of commits of any type.