NNS1-2849: Add derived token stores

[dskloetd]

Motivation

tokensStore used to be keyed by universe ID but in order to reuse the IcrcWalletPage for the SnsWallet, it needed to be keyed by ledger canister ID. But there are other context where it is still more convenient to access the token by universe ID or root canister ID. It is currently temporarily keyed by both, which means it has the same tokens multiple times. But converting root canister ID to ledger canister ID every time would be tedious.
Additionally, the SNS tokens data already exists in the aggregator data, which means we now have several sources of truth for the tokens data.

The clean solution is to have 1 source of truth, and derived stores for everything else.

So with this PR:

• tokensStore only holds non-SNS tokens
• snsAggregatorStore becomes the only source of truth for SNS tokens
• several derived tokens stores are added to be used to actually get a token by universe ID, root canister ID or ledger canister ID.

Changes

1. Stop adding SNS tokens to tokensStore in both lib/services/$public/sns.services.ts (for production) and tests/utils/sns.test-utils.ts for testing.
2. Add derived stores snsTokensByRootCanisterIdStore, snsTokensByLedgerCanisterIdStore, tokensByUniverseIdStore and tokensByLedgerCanisterIdStore.
3. Use the derived stores as appropriate in places where the tokensStore was used directly before.
4. In loadIcrcToken and loadToken, don't load the token if it's a known SNS token as it should already be available in the appropriate derived stores.
5. Support setting a fee in the aggregator test token data.
6. Make the lifecycle optional in the aggregator test data.

Tests

1. Unit test for the added derived stores.
2. Unit test that loadIcrcToken doesn't load SNS tokens.
3. Existing unit tests updated to rely on token data from the aggregator data.

Todos

• Add entry to changelog (if necessary).

[lmuntaner]

Thanks!

Just a few comments, but it looks good!

[mstrasinskis]

LGTM, thank you!