feat: rename klaytn chain to kaia

Co-Authored-By: Amin Moghaddam <[email protected]>

Author: devin-ai-integration[bot]

contract_manager/store/chains/EvmChains.yaml

@@ -635,12 +635,12 @@
   rpcUrl: https://node.mainnet.etherlink.com/
   networkId: 42793
   type: EvmChain
-- id: klaytn
+- id: kaia
   mainnet: true
   rpcUrl: https://rpc.ankr.com/klaytn
   networkId: 8217
   type: EvmChain
-- id: klaytn_testnet
+- id: kaia_testnet
   mainnet: false
   rpcUrl: https://rpc.ankr.com/klaytn_testnet
   networkId: 1001