IsGoMod is used to determine whether workDir is a go module project through command `go env GOMOD`.

Prepare checks the project which module belongs to,and returns the path and module.

UpdateGoWorkIfExist updates go work if workDir is in a go workspace.

Module contains the relative data of go module, which is the result of the command go list.

ProjectContext is a structure for the project, which contains WorkDir, Name, Path and Dir.