Support gnoland testnet6

[jeongseup]

PR(Pull Request) Overview

Briefly describe the changes made in this PR.

Changes

• Major feature addition or modification
• Bug fix
• Code improvement
• Documentation update

Related Issue

Please reference the Issue number this PR addresses: #90

Description of Changes

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Testing Method

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Additional Information

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[jeongseup]

Double checked

[jeongseup]

# for gno.land/r/demo/foo20.TotalSupply() realms

# post call
curl --location 'https://rpc.test6.testnets.gno.land/' \
--header 'Content-Type: application/json' \
--data '{
    "id": "7491f929-f5fd-4866-8101-4358142738de",
    "jsonrpc": "2.0",
    "method": "abci_query",
    "params": ["vm/qeval", "Z25vLmxhbmQvci9kZW1vL2ZvbzIwLlRvdGFsU3VwcGx5KCk=", "0", false]
}'

# get call
https://rpc.test6.testnets.gno.land/abci_query?path="vm/qeval"
&data="Z25vLmxhbmQvci9kZW1vL2ZvbzIwLlRvdGFsU3VwcGx5KCk="