v0.7.1 Added support for go.work and new %cd command

[janpfeifer]

• Added support for tracking go.work, which allows auto-complete and contextual help
  to work with the local modules configured. It also requires gopls v0.12.4 or newer to work.
• Fixed auto-complete bug when no main function (or no %%) was present in cell.
• Added special command %cd to chance current directory.
• Commands %cd and %env prints results of its execution.

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This discussion was created from the release v0.7.1 Added support for `go.work` and new `%cd` command.