Add multiple libraries installation when using --git-url or --zip-path flags

[silvanocerza]

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• 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)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

• What kind of change does this PR introduce?

Enhances an existing command.

• What is the current behavior?

When calling lib install with the --git-url or --zip-path flags only one library at a time can be installed, subsequent arguments are ignored.

# This would install only WiFi101 library
arduino-cli lib install --git-url https://github.com/arduino-libraries/WiFi101.git https://github.com/arduino-libraries/ArduinoBLE.git
# This would install only ArduinoBLE library
arduino-cli lib install --zip-path /path/to/ArduinoBLE.zip /path/to/WiFi101.zip

• What is the new behavior?

Calling lib install with --git-url or --zip-path flags will install all libraries specified.

# This will install only WiFi101 and ArduinoBLE libraries
arduino-cli lib install --git-url https://github.com/arduino-libraries/WiFi101.git https://github.com/arduino-libraries/ArduinoBLE.git
# This will do the same
arduino-cli lib install --zip-path /path/to/ArduinoBLE.zip /path/to/WiFi101.zip

• Does this PR introduce a breaking change, and is titled accordingly?

No.

• Other information:

None.

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[ubidefeo]

Just realised an issue with installing from zip file:
the directory structure is lost on decompressing.
@silvanocerza : REGRESSION 🤯