feat(sns): Enable upgrading SNS-controlled canisters using chunked WASMs

[aterga]

This PR extends the existing proposal type UpgradeSnsControllerCanister with a new field chunked_canister_wasm that can be used for specifying an upgrade to a large WASM module (over 2 MiB) priorly uploaded to some store canister.

Example proposal render for chunked Wasm:

# Proposal to Upgrade an SNS Controlled Canister

## Target canister: xbgkv-fyaaa-aaaaa-aaava-cai

## Wasm info

Remote module stored on canister zyo6l-paaaa-aaaaa-aabxq-cai with SHA256 `010203`. Split into 3 chunks:
  - `010101`
  - `020202`
  - `030303`

## Mode: Upgrade

## Argument info

No upgrade argument.

Example proposal render for embedded Wasm:

# Proposal to upgrade SNS controlled canister:

## Target canister id: xbgkv-fyaaa-aaaaa-aaava-cai

## Wasm info

Embedded module with 8 bytes and SHA256 `93a44bbb96c751218e4c00d479e4c14358122a389acca16205b1e4d0dc5f9476`.

## Mode: Upgrade

## Argument info

Upgrade argument with 8 bytes and SHA256 `0a141e28323c4650`.

[github-actions]

If this pull request affects the behavior of any canister owned by
the Governance team, remember to update the corresponding
unreleased_changes.md file(s).

To acknowldge this reminder (and unblock the PR), dismiss this
code review by going to the bottom of the pull request page, and
supply one of the following reasons:

1. Done.

2. No canister behavior changes.

[aterga]

TODO: Extend the rs/nervous_system/integration_tests/tests/upgrade_sns_controlled_canister_with_large_wasm.rs test to submit a proposal that would tirgger the upgrade.

Done

[daniel-wong-dfinity-org]

I think you need to modify the second example in your PR description? It lists chunks, but IIUC, the idea is that "embedded Wasm" means that there are no chunks.

changelog files have not been added for SNS yet, but that will happen very soon. If that goes in before this, then, yes, let's update those. Otherwise, this shouldn't be a blocker.

[max-dfinity]

Approved, but with changes requested from our conversation.