[Improvement] A better way for plugins to use the account's native token balance

[adam-alchemy]

• Right now the only configuration ability we give plugins to decide whether or not they should have permission to spend the account’s native token amount is via the manifest field canSpendNativeToken. This helps somewhat, but there may be some other plugin features that could benefit from “pulling” native tokens from the account address to the plugin address, or by “pushing” native tokens in the fallback itself.
  • Due to the current restriction that execute/executeBatch/executeFromPluginExternal cannot send to plugins, the native token amount cannot go directly to the calling plugin.
• We should investigate whether this use case makes sense to include into the standard’s design, and if so, how to go about doing it.