fix: Save SNS canister IDs

[bitdivine]

Description

This addresses two problems with the call to sns to create SNS canisters:

• The sns command line tool is not always able to locate the did file, so fails to parse the sns deploy response.
• The sns command line tool saves canister ids in canister_ids.json but this is incorrect when deploying to local. Given that the --network flag is not supported, all deployments are to local, at least now.

Changes

Use two new flags provided by the sns binary:

• --candid provides the location of the candid file, so that the response is parsed reliably.
• --save-to specifies to which canister_ids file to save the SNS canister IDs. This points to the file for local deployments and can be pointed at different locations once the --network flag is supported.

How Has This Been Tested?

This needs a more recent sns binary than the one currently in master, so this PR will fail in CI until we have upgraded. I believe the current protocol is to open a branch for an anticipated new blessed version of the ic, merge changes such as this into there, then merge that branch into master once the version has been blessed. We could bump just the sns binary; it is currently not used for anything other than this. Doing so would save a lot of time.

I have tested locally by installing dfx with a matching sns thus:

export PATH="$PWD/target/debug:$PATH"
dfx cache install
cp -f /home/max/dfn/ic-gitlab/rs/target/debug/sns "$(dfx cache show)/sns"

Checklist:

• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.
  This is a noop