Add archive command to zip a sketch and its files

[silvanocerza]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce?
  New CLI command and new gRPC interface.

• What is the current behavior?
  User can't create an archive of a Sketch from the CLI.
  gRPC consumer doesn't have an interface to archive a Sketch.

• What is the new behavior?
  User can create a zip file containing all files from a Sketch, build directory is only included if explicitly specified with the --include-build-dir flag.

Some possible examples on how to call the command from the CLI:

arduino-cli archive
arduino-cli archive .
arduino-cli archive . <some_folder>
arduino-cli archive . <some_folder>/MySketchArchive.zip
arduino-cli archive <path_to_sketch>
arduino-cli archive <path_to_sketch> <some_folder>
arduino-cli archive <path_to_sketch> <some_folder>/MySketchArchive.zip

• Does this PR introduce a breaking change?
  No.

• Other information:
  None.

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[silvanocerza]

Links check is failing again because of https://codecov.io/gh/arduino/arduino-cli, it seems to work finely on the browser for me though.
The rest of the tests are finally working too. 🎉

[cmaglie]

I've made some suggestions to slightly simplify here and there.

I'm wondering if the case:

arduino-cli archive . /path/to/some/dir/name

should automatically infer that we mean /path/to/some/dir/name.zip when the name folder doesn't exists. Personally, if I don't specify explicitly .zip I would expect a /path/to/some/dir/name: directory does not exists, but I'll leave to @ubidefeo the last word on this.

[cmaglie]

Nice work BTW, especially on the tests!

[cmaglie]

👍