Add --log global flag as alias for --verbose/-v

[cmaglie]

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• 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)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Adds a --log global flag and hides the old -v.
This change allows to print logs with commands that have their own -v flag overridden (compile and upload).

What is the current behavior?

$ arduino-cli
[...]
      --log-file string           Path to the file where logs will be written.
      --log-format string         The output format for the logs, can be: text, json
      --log-level string          Messages with this level and above will be logged. Valid levels are: trace, debug, info, warn, error, fatal, panic
      --no-color                  Disable colored output.
  -v, --verbose                   Print the logs on the standard output.

$ arduino-cli compile -b arduino:avr:uno -v
[...there is no way to display log with compile command...]

$ arduino-cli upload -b arduino:avr:uno -p /dev/ttyACM0 -v
[...there is no way to display log with upload command...]

What is the new behavior?

$ arduino-cli
[...]
      --log                       Print the logs on the standard output.
      --log-file string           Path to the file where logs will be written.
      --log-format string         The output format for the logs, can be: text, json
      --log-level string          Messages with this level and above will be logged. Valid levels are: trace, debug, info, warn, error, fatal, panic
      --no-color                  Disable colored output.

Use "arduino-cli [command] --help" for more information about a command.

$ arduino-cli compile -b arduino:avr:uno -v --log
[...run verbose compile and print logs together...]

$ arduino-cli upload -b arduino:avr:uno -p /dev/ttyACM0 -v
[...run verbose upload and print logs together...]

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

The old -v flag is not removed but just hidden, everything will continue to work as before.

Other information

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.03% ⚠️

Comparison is base (b678f6f) 62.97% compared to head (53645d3) 62.94%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2258      +/-   ##
==========================================
- Coverage   62.97%   62.94%   -0.03%     
==========================================
  Files         220      220              
  Lines       19501    19523      +22     
==========================================
+ Hits        12280    12288       +8     
- Misses       6137     6147      +10     
- Partials     1084     1088       +4     

Flag	Coverage Δ
unit	62.94% <50.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
arduino/cores/packagemanager/package_manager.go	76.61% <0.00%> (-0.44%)	⬇️
arduino/resources/index.go	46.29% <33.33%> (-2.73%)	⬇️
commands/instances.go	64.43% <64.28%> (-0.27%)	⬇️
internal/cli/cli.go	87.26% <100.00%> (+0.16%)	⬆️

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