[Task] Remove Storage::set_password

[cycraig]

Description

Remove the set_password() function from the account Storage interface.

Motivation

Password management is specific to Stronghold right now and should be handled by the Stronghold wrapper or its library rather than requiring that all Storage implementers deal with it.

Resources

This is a sub-task extracted from:

• [Task] Wasm Bindings Improvements  #669

To-do list

• Remove Storage::set_password

Change checklist

Add an x to the boxes that are relevant to your changes, and delete any items that are not.

• The feature or fix is implemented in Rust and across all bindings whereas possible.
• The feature or fix has sufficient testing coverage
• All tests and examples build and run locally as expected
• Every piece of code has been document according to the documentation guidelines.
• If conceptual documentation (mdbook) and examples highlighting the feature exist, they are properly updated.
• If the feature is not currently documented, a documentation task Issue has been opened to address this.