feat: flare mainnet/testnet rpc support (#595)

* feat: flare mainnet/testnet rpc support

* Format file

Author: Uttam-Singhh

src/StdChains.sol

@@ -246,6 +246,10 @@ abstract contract StdChains {
         setChainWithDefaultRpcUrl(
             "berachain_bartio_testnet", ChainData("Berachain bArtio Testnet", 80084, "https://bartio.rpc.berachain.com")
         );
+        setChainWithDefaultRpcUrl("flare", ChainData("Flare", 14, "https://flare-api.flare.network/ext/C/rpc"));
+        setChainWithDefaultRpcUrl(
+            "flare_coston2", ChainData("Flare Coston2", 114, "https://coston2-api.flare.network/ext/C/rpc")
+        );
     }
 
     // set chain info, with priority to chainAlias' rpc url in foundry.toml

test/StdChains.t.sol

@@ -80,6 +80,8 @@ contract StdChainsTest is Test {
     //     _testRpc("fraxtal");
     //     _testRpc("fraxtal_testnet");
     //     _testRpc("berachain_bartio_testnet");
+    //     _testRpc("flare");
+    //     _testRpc("flare_coston2");
     // }
 
     function test_ChainNoDefault() public {