Added BoardIdentify gRPC call.

[cmaglie]

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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

Adds the BoardIdentify gRPC call, this function performs the board identification based on the given "upload port properties".

What is the current behavior?

What is the new behavior?

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

Other information

[codecov]

Codecov Report

Attention: Patch coverage is 67.27273% with 54 lines in your changes missing coverage. Please review.

Project coverage is 67.68%. Comparing base (82f37f2) to head (85cbc63).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
commands/service_board_identify.go	67.40%	31 Missing and 13 partials ⚠️
commands/service_board_list.go	66.66%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #2794 +/- ## ========================================== + Coverage 67.61% 67.68% +0.06%  ========================================== Files 238 239 +1 Lines 22392 22396 +4 ========================================== + Hits 15141 15159 +18 + Misses 6062 6045 -17 - Partials 1189 1192 +3 

Flag	Coverage Δ
unit	67.68% <67.27%> (+0.06%)	⬆️

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