[Task] Deprecate diff chain updates

[cycraig]

Description

Mark all public functions that work with diff chain resolutions, merges or updates as deprecated. This includes the top-level APIs such as the Account, Client, and Resolver as well as any exposed functions for creating or merging diffs.

We should also always publish full integration chain updates in the Account to prevent anyone from performing diff updates that may not be forwards compatible.

Motivation

The diff chain is at-risk and will likely be removed due to possible technical infeasibility going forward.

To-do list

• Mark diff chain functions as deprecated.
  • Rust
  • Wasm
• Change Account to always perform integration chain updates.

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.