Tracking issue of GSP-840: Convert to monorepo

[Xuanwo]

• GSP: GSP-840: Convert to monorepo #840

Roadmap

• Update mod files to v5
• Update mod name to go.beyondstorage.io
• Convert pkg/* as separate modules (Only credential and endpoint need to be spilt)
  • credential,endpoint: Split from pkg #843
  • credential: Bump to version 1.0.0 #845
  • endpoint: Bump to version 1.2.0 #846
• Integration tests (we need to figure how to run integration tests on a mono repo)
  • refactor(tests): Move go-integration-tests here #847
• Convert all service as separate modules. #851
• Auto releases (we can build an auto release now!)
• Dependence updates (feat(ci): Add new entry in dependabot #873)
• Update docs and examples
  • fix(docs/go-storage): Fix import path site#255

Progress

• We are trying to build a demo of this mono repo.
• https://go.beyondstorage.io is online, we are ready for the repo changes.
• We will migrate all code first and then update all our workflows to meet mono repo needs
• Auto release is hard for our repo, we will find a solution for it in the futher.

[JinnyYi]

Maybe we need to update all the referenced links in docs and comments, or add a note where appropriate?