add ethereum classic rpc endpoints

[chris-mercer]

• etcmc mainnet
• etcmc testnet

[github-actions]

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[chris-mercer]

@ligi this is a minimal update. I'm simply adding two rpc endpoint entries for mainnet and testnet. These are much needed archival endpoints for dapp developers on ETC.

Reading the logs it looks like some deprecated elements are being used in the build, but doesn't appear to be coming from any changes on my side in the PR.

> Task :processor:run FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':processor:run'.
> Process 'command '/usr/lib/jvm/temurin-11-jdk-amd64/bin/java'' finished with non-zero exit value 1

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.

> Run with --scan to get full insights.
> Get more help at https://help.gradle.org./

BUILD FAILED in 1m 3s
Deprecated Gradle features were used in this build, making it incompatible with Gradle 9.0.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.