add form mainnet

[arrayofone]

This PR aims to add the form mainnet blockchain to chainlist. It also modifies the existing form testnet configuration to update urls.

> Task :model:checkKotlinGradlePluginConfigurationErrors SKIPPED
> Task :model:kspKotlin UP-TO-DATE
> Task :model:compileKotlin UP-TO-DATE
> Task :model:compileJava NO-SOURCE
> Task :model:processResources UP-TO-DATE
> Task :model:classes UP-TO-DATE
> Task :model:jar UP-TO-DATE
> Task :processor:checkKotlinGradlePluginConfigurationErrors SKIPPED
> Task :processor:compileKotlin UP-TO-DATE
> Task :processor:compileJava NO-SOURCE
> Task :processor:processResources NO-SOURCE
> Task :processor:classes UP-TO-DATE
> Task :processor:run

BUILD SUCCESSFUL in 8s
6 actionable tasks: 1 executed, 5 up-to-date

[github-actions]

You successfully submitted a PR! Due to the amount of PRs coming in: we will only look at PRs that the CI is happy with. We can also not hold your hand getting the CI green - just look how others that where merged did it and RTFM. So as long as there is any CI check that reports an error - no human will look at this. You might be able to ask for some support after supporting the project - e.g. by sending funds to lists.eth. When you fixed things after a requested change - then you also need to (re-)request a review.

[github-actions]

PR merged - please consider contributing some funds to lists.eth