Allow port, protocol and port settings to be specified in profiles.

[cmaglie]

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• The PR has no duplicates (please search among the Pull Requests
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• 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)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

• Allow specifying the default port and protocol on a per-profile basis.
• Allows specifying default port settings (like baudrate, etc...) on a per-sketch and per-profile basis.

What is the current behavior?

Default port and protocol can not be specified per-profile.
Port settings can not be specified either per-sketch or per-profile.

What is the new behavior?

The above features are now allowed inside sketch.yaml:

profiles:
  uno:
    fqbn: arduino:avr:uno
    platforms:
      - platform: arduino:avr (1.8.6)
    libraries:
      - RTClib (2.1.4)
      - Adafruit BusIO (1.16.1)
    port: /dev/ttyACM2
    port_config:
      baudrate: 9600
      bits: 9

default_fqbn: arduino:samd:arduino_zero_native
default_port: /dev/ttyACM0
default_port_config:
  baudrate: 115200
  bits: 9

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

Other information

Fix #2640
FIx #2554

[codecov]

Codecov Report

Attention: Patch coverage is 43.26923% with 59 lines in your changes missing coverage. Please review.

Project coverage is 67.57%. Comparing base (863c1ec) to head (0271d36).

Files with missing lines	Patch %	Lines
internal/arduino/sketch/profiles.go	17.24%	19 Missing and 5 partials ⚠️
internal/cli/monitor/monitor.go	61.81%	18 Missing and 3 partials ⚠️
internal/arduino/sketch/sketch.go	20.00%	7 Missing and 1 partial ⚠️
internal/cli/arguments/fqbn.go	14.28%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2717      +/-   ##
==========================================
- Coverage   67.68%   67.57%   -0.12%     
==========================================
  Files         234      234              
  Lines       22226    22283      +57     
==========================================
+ Hits        15043    15057      +14     
- Misses       6001     6036      +35     
- Partials     1182     1190       +8     

Flag	Coverage Δ
unit	67.57% <43.26%> (-0.12%)	⬇️

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[alessio-perugini]

LGTM.

It would be awesome to add a test similar to monitor_test.go
That tests for the new profile configs.

Do you think it can be done without too much pain?