[GOCA] Migrate from glide to Go Modules

[eripa]

Description
The GOCA library should use the official Go modules functionality to manage dependencies instead of Glide.

Use case
Using Go modules enables better tool and system integration. https://github.com/golang/go/wiki/Modules

Interface Changes
N/A

Additional Context
go mod init supports automatic migration of glide managed dependencies.

Progress Status

• Branch created
• Code committed to development branch
• Testing - QA
• Documentation
• Release notes - resolved issues, compatibility, known issues
• Code committed to upstream release/hotfix branches
• Documentation committed to upstream release/hotfix branches

[treywelsh]

Notes to the reviewer: It needs at least the version 1.12 of Go
Users with Go installed via a package manager like Apt under Ubuntu may have an older version, then they will have to install a newer version of Go.