FR: do not allow uninstall plug-in if only one installed - avoid bricked accounts

[avarobinson]

Is your feature request related to a problem? Please describe.
Bricked accounts can occur when uninstalling plug-ins if there is only 1 plug-in installed. For example, using a createAlchemyModularAccountClient will default install multi-owner plugin. If you uninstall this plugin in a single action, the account will no longer have a validation function and will become bricked.

Valid use case: adding on multi-sig functionality to a modular account

Describe the solution you would like

• when calling uninstallPlugin actions, enforce that more than 1 plugin is installed, and throw if it's the last plugin
• can use getInstalledPlugins().length == 1 for a check

Describe alternatives you have considered

• Expose MA action that allows for simple switch from MA with one owner to multi-sig ownership (this will avoid requiring calldata to be encoded manually and can be exposed with account actions instead)
• This should be a fast follow to the check for currently installed plugins

Additional context
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