Add hidden tokens to store

[PatrykLucka]

PR adds hidden tokens to store, to prevent adding them automatically if balance > 0 is detected.
Fixes #5055

[github-actions]

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[Gudahtt]

The code looks good to me!

The only reservation I have is that this list of hidden tokens isn't visible to the user. This could be confusing, especially considering our old behaviour. Maybe we could add it in settings somewhere? 🤔

Or perhaps this is fine for now, and we can add UI later as an enhancement?

[rekmarks]

Regardless of how this goes, we have some follow-up work to do:

• Un-hide my hidden tokens #9813
• Optimize token data storage in preferences controller #9814

[darkwing]

Oops, this is failing one test. Please have another look @PatrykLucka ! Thank you!

[brad-decker]

@rekmarks I think this is ready for another look

[rekmarks]

There are a number of methods in the preferences controller related to adding, removing, or otherwise modifying identies/accounts, and they modify accountTokens. Shouldn't we also modify accountHiddenTokens in these cases?

[PatrykLucka]

@rekmarks you're right, I updated preferences controller, please take a look.

[tmashuang]

From a behavioral standpoint this PR fixes the issue with tracking, and persisting, tokens that the user hides. Whether we can/should optimize this to prevent duplicates of the accountHiddenTokens and hiddenToken is a point of contention, but it acts similiarly to how we track tokens and accountTokens.

Also to note, for tokens under a custom network there is no way to distinguish different sets of custom network hidden tokens, they are all under the rpc property, same as accountTokens.

LGTM!