Added "toBeInvokable" arch expectation.

tests/Features/Expect/toBeInvokable.php

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+<?php
+
+use Pest\Arch\Exceptions\ArchExpectationFailedException;
+
+test('class is invokable')
+    ->expect('Tests\\Fixtures\\Arch\\ToBeInvokable\\IsInvokable\\InvokableClass')
+    ->toBeInvokable();
+
+test('opposite class is invokable')
+    ->throws(ArchExpectationFailedException::class)
+    ->expect('Tests\\Fixtures\\Arch\\ToBeInvokable\\IsInvokable\\InvokableClass')
+    ->not->toBeInvokable();
+
+test('class is invokable via a parent class')
+    ->expect('Tests\\Fixtures\\Arch\\ToBeInvokable\\IsInvokable\\InvokableClassViaParent')
+    ->toBeInvokable();
+
+test('class is invokable via a trait')
+    ->expect('Tests\\Fixtures\\Arch\\ToBeInvokable\\IsInvokable\\InvokableClassViaTrait')
+    ->toBeInvokable();
+
+test('failure when the class is not invokable')
+    ->throws(ArchExpectationFailedException::class)
+    ->expect('Tests\\Fixtures\\Arch\\ToBeInvokable\\IsNotInvokable\\IsNotInvokableClass')
+    ->toBeInvokable();
+
+test('class is not invokable')
+    ->expect('Tests\\Fixtures\\Arch\\ToBeInvokable\\IsNotInvokable\\IsNotInvokableClass')
+    ->not->toBeInvokable();

tests/Fixtures/Arch/ToBeInvokable/IsInvokable/InvokableClass.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToBeInvokable\IsInvokable;
+
+class InvokableClass
+{
+    public function __invoke(): void
+    {
+
+    }
+}

tests/Fixtures/Arch/ToBeInvokable/IsInvokable/InvokableClassViaParent.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToBeInvokable\IsInvokable;
+
+class InvokableClassViaParent extends ParentInvokableClass
+{
+    //
+}

tests/Fixtures/Arch/ToBeInvokable/IsInvokable/InvokableClassViaTrait.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToBeInvokable\IsInvokable;
+
+class InvokableClassViaTrait
+{
+    use InvokableTrait;
+}

tests/Fixtures/Arch/ToBeInvokable/IsInvokable/InvokableTrait.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToBeInvokable\IsInvokable;
+
+trait InvokableTrait
+{
+    public function __invoke(): void
+    {
+        //
+    }
+}

tests/Fixtures/Arch/ToBeInvokable/IsInvokable/ParentInvokableClass.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToBeInvokable\IsInvokable;
+
+class ParentInvokableClass
+{
+    public function __invoke(): void
+    {
+
+    }
+}

tests/Fixtures/Arch/ToBeInvokable/IsNotInvokable/IsNotInvokableClass.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToBeInvokable\IsNotInvokable;
+
+class IsNotInvokableClass
+{
+    public function handle(): void
+    {
+
+    }
+}