Added backward compatibilty policy document (arduino#2470)

* Added versioning/upgrading policy

* Added backward compatibility policy

Fix caching for libraries when installation folder differents from Na…

…me (arduino#2446)

* Fix caching for libraries when installation folder differents from Name

* Prepare infra to add integration test

* Added integration test

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Co-authored-by: Cristian Maglie <[email protected]>

Added `debug check` command to check if a combination of board/progra…

…mmer supports debugging. (arduino#2443)

* Moved rcp message to proper position

* Added gRPC command to check for debugger support

* Made debug flags var non-global

* Implementation of 'debug check' command

* Implementation of cli command 'debug check'

* added integration test

* Renamed field for clarity

* Added minimum debug_fqbn computation in 'debug check' command

fix: debugging requires a non empty debug.executable (arduino#2439)

* fix: debugging requires a non empty debug.executable

* Updated docs

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Co-authored-by: Cristian Maglie <[email protected]>

regression: Import fix for `compile --input-dir .` regression found in …

…arduino#2304 (arduino#2305)

* Add support for default build profile (arduino#2203)

* Add support for default profile to compile command

* Add support for default profiles to upload command

* Add TestCompileWithDefaultProfile to integration tests

* Get the profile's FQBN if it's not already specified in the request

* Update documentation regarding sketch projects

* Added integration tests for all default_profile cases

* Reverted old sketch_with_profile test

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Co-authored-by: Cristian Maglie <[email protected]>

* [skip-changelog] Use `LoadSketch` in upload function and return `rpc.Port` in `GetPort` (arduino#2297)

* Change GetPort's returned type to rpc.Port

* Use LoadSketch in runUploadCommand

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Co-authored-by: MatteoPologruto <[email protected]>