[FEATURE] Added Blackfire Support

[lewisvoncken]

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• I have checked that there aren't other open pull requests for the same issue ticket.
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I have read the contribution guidelines and am targeting the branch 2.x:
Because this is a Feature which is Backwards Compatible.

Changelog entry:
Short description of your work as explained by: Keep A Changelog.

Added

• Blackfire Support wiki changes are added in a patch file

https://github.com/weprovide/valet-plus/files/4179355/blackfire_wiki.txt

[Neodork]

/AzurePipelines run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Neodork]

@lewisvoncken All tests pass, can you create a issue ticket for this explaining why Valet+ would need this implemented? Edit: It also seems to conflict. Can you solve the conflicts as well?

[mischabraam]

Tests my be passed, but I don't think this is complete. The switch case for commands has no breaks. So the command valet blackfire test will not break the switch untill valet blackfire disable|off. I don't think that is correct behavior. Could be, but I'd rather see a clarification first.

[SanderAtom]

@lewisvoncken Can you clarify why the test, register and config commands have no breaks/returns? If you run test, it will also run the through the register, config and off commands.
I'm going to apply this locally and run it because I need to use Blackfire, so I don't mind fixing that if it's a bug.

[SanderAtom]

The installation of Blackfire breaks if you don't have the right xcode version.

==> Installing blackfire-agent from blackfireio/blackfire
==> Downloading https://packages.blackfire.io/homebrew/blackfire-agent_1.45.1_amd64.tar.gz
Error: Your Xcode (10.2.1) is too outdated.
Please update to Xcode 12.3 (or delete it).

Can we check for this before installing?