gRPC: Added CheckForArduinoCLIUpdates RPC call

[cmaglie]

Please check if the PR fulfills these requirements

See how to contribute

• [X] The PR has no duplicates (please search among the Pull Requests before creating one)
• [X] 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?

Adds a gRPC call CheckForArduinoCLIUpdates.

What is the current behavior?

No changes.

What is the new behavior?

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

No

Other information

This will be part of a bigger refactoring #2565

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 24.27184% with 78 lines in your changes are missing coverage. Please review.

Project coverage is 69.47%. Comparing base (af85d57) to head (a54ed9e).

Files	Patch %	Lines
commands/updatecheck/check_for_updates.go	8.47%	54 Missing :warning:
internal/cli/cli.go	62.50%	11 Missing and 1 partial :warning:
internal/cli/version/version.go	0.00%	9 Missing :warning:
commands/daemon/daemon.go	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2573 +/- ## ========================================== - Coverage 69.54% 69.47% -0.08% ========================================== Files 206 207 +1 Lines 20264 20283 +19 ========================================== - Hits 14093 14092 -1 - Misses 5054 5077 +23 + Partials 1117 1114 -3 ``` | [Flag](https://app.codecov.io/gh/arduino/arduino-cli/pull/2573/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=arduino) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/arduino/arduino-cli/pull/2573/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=arduino) | `69.47% <24.27%> (-0.08%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=arduino#carryforward-flags-in-the-pull-request-comment) to find out more.

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