feat: modular widget

[effie-ms]

Which Jira task is linked to this PR?

LF-15704

Why was it implemented this way?

Separates ecosystem handlers into separate packages, for modular architecture, not to bundle them within the widget when users do not use them.

The idea is that widget context providers with their dependencies are packaged intp separate packages (e.g. @lifi/widget-provider-sui), and then, if they are installed and imported by users and passed as props to , the widget renders them. On render, all the handlers and info needed by wallet-management get set to the @lifi/widget-provider. And when wallet-management needs anything, it reads the info/handlers from the widget-provider (not imports them from external libs as before). So both widget and wallet-management become independent from external dependencies.
A separate package for the widget-provider is needed to avoid circular dependencies.

TODO:

1. formatUnits(), parseUnits(), isHex() - now copy-pasted from viem to widget. Move to SDK?
2. Once wallet provider packages are released, change their versions in examples/ (+ proper testing needed)
3. Public documentation update
4. Installation instructions - need longer README
5. Split chains.types config into from and to

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