feat!: ic-cdk-bindgen v0.2 to support Trait-Bound Canister Development

[lwshang]

Description

This feature is developed on a dedicated branch bindgen_next.

You can check the history:

• #486 : Change the API to decouple from candid_parser and allow for further config with the Builder.
• #502

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

Checklist:

• [ ] The title of this PR complies with Conventional Commits.
• [ ] I have edited the CHANGELOG accordingly.
• [ ] I have made corresponding changes to the documentation.