feat: improve zkstack based plugins

[aalimsahin]

Relates to:

N/A (Improving zkstack plugin architecture and consistency)

Risks

Low. The changes involve refactoring and updating multiple plugins (plugin-abstract, plugin-zksync-era, plugin-cronoszkevm) to use viem for consistency.

Background

What does this PR do?

Improved environment validation for plugin-abstract, plugin-cronoszkevm, plugin-zksync-era.
Integrated viem for functionality in plugin-cronoszkevm, plugin-zksync-era for maintenance.
Added ens support to them.
Fixed issues in plugin-zksync-era and plugin-cronoszkevm where previous changes caused them to break.

What kind of change is this?

Bug fixes, Improvements and feature

Documentation changes needed?

As I check, no need

Testing

Where should a reviewer start?

Almost all plugins are the same, so you can choose one. After that, others will be the same.

Detailed testing steps

Initialize plugins in character.
You can choose to test one of them.
Add envs for the plugin. Try the wrong env to test env validation.
Start one client to check it. You can say to agent like send x amount eth to y address(or ens) in z chain

NOTE

Fixed the overflow problem in chat. You can check last image.

Discord username

aalimsahin