chore: add provider getter

contracts/GitcoinPassportDecoder.sol

@@ -68,12 +68,19 @@ contract GitcoinPassportDecoder is
   function _authorizeUpgrade(address) internal override onlyOwner {}
 
   /**
-  1 * @dev Gets the EAS contract.
+   * @dev Gets the EAS contract.
    */
   function getEASAddress() public view returns (IEAS) {
     return eas;
   }
 
+  /**
+    * @dev Gets providers by version.
+   */
+   function getProviders(uint32 version) public view returns (string[] memory) {
+     return providerVersions[version];
+   }
+
   /**
    * @dev Sets the address of the EAS contract.
    * @param _easContractAddress The address of the EAS contract.

test/GitcoinPassportDecoder.ts

@@ -263,6 +263,22 @@ describe("GitcoinPassportDecoder", function () {
       expect(lastProvider === "NewStamp3");
     });
 
+    it("should return provider given a version", async function () {
+      const providers = ["NewStamp1", "NewStamp2"];
+      await this.gitcoinPassportDecoder
+        .connect(this.owner)
+        .addProviders(providers);
+
+      const currentVersion = await this.gitcoinPassportDecoder.currentVersion();
+
+      const savedProviders = await this.gitcoinPassportDecoder.getProviders(
+        currentVersion
+      );
+
+      expect(savedProviders.length === providers.length);
+      expect(savedProviders).to.eql(providers);
+    });
+
     it("should not allow anyone other than owner to append new providers array in the provider mapping", async function () {
       await expect(
         this.gitcoinPassportDecoder