feat(boundaries): boundaries tags

[NicholasLYang]

Description

Implements boundary tags by adding a boundaries field to turbo.json. This field allows you to specify an allowlist and denylist for both dependencies and dependents. The deny list takes precedence over the allowlist (like with our globs).

The commit history should be good enough to review one by one, in theory lol.

Testing Instructions

Added some tests both in existing boundaries fixture and in a new boundaries_tags fixture.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
examples-basic-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-designsystem-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-gatsby-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-kitchensink-blog	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-native-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-nonmonorepo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-svelte-web	🔄 Building (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-tailwind-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm
examples-vite-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 5:25pm

[NicholasLYang]

@anthonyshew, basically we now define rules at the root level and those rules operate on tags, not on individual packages. So to declare that a web tag can only depend on ui tags, we declare:

{
    "boundaries": {
        "tags": {
            "web": {
               "dependencies": {
                    "allow": ["ui"]
                }
            } 
        }
    }
}

To additionally reject packages with the unsafe tag, we put:

{
    "boundaries": {
        "tags": {
            "web": {
               "dependencies": {
                    "allow": ["ui"],
                    "deny": ["unsafe"]
                }
            } 
        }
    }
}

[anthonyshew]

That works for me. I'm of the mind that we should put this into people's hands and get feedback!