feat: Implement Multiprovider feature

CODEOWNERS

@@ -7,3 +7,6 @@
 # @global-owner1 and @global-owner2 will be requested for
 # review when someone opens a pull request.
 *       @tcarrio
+
+# MultiProvider implementation
+/src/implementation/multiprovider/  @tmakinde

src/implementation/multiprovider/FinalResult.php

@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenFeature\implementation\multiprovider;
+
+use OpenFeature\interfaces\provider\ResolutionDetails;
+use Throwable;
+
+use function count;
+
+/**
+ * Represents the final result from a multi-provider evaluation strategy.
+ * Contains either successful resolution details or aggregated errors.
+ */
+class FinalResult
+{
+    /**
+     * @param ResolutionDetails|null $details The final resolution details if successful
+     * @param string|null $providerName The name of the provider that provided the final result
+     * @param array<int, array{providerName: string, error: Throwable}>|null $errors Array of errors from providers if unsuccessful
+     */
+    public function __construct(
+        private ?ResolutionDetails $details = null,
+        private ?string $providerName = null,
+        private ?array $errors = null,
+    ) {
+    }
+
+    public function getDetails(): ?ResolutionDetails
+    {
+        return $this->details;
+    }
+
+    public function getProviderName(): ?string
+    {
+        return $this->providerName;
+    }
+
+    /**
+     * @return array<int, array{providerName: string, error: Throwable}>|null
+     */
+    public function getErrors(): ?array
+    {
+        return $this->errors;
+    }
+
+    public function isSuccessful(): bool
+    {
+        return $this->details !== null && $this->errors === null;
+    }
+
+    public function hasErrors(): bool
+    {
+        return $this->errors !== null && count($this->errors) > 0;
+    }
+}