fix: Correct KeyringAccountType values

[ccharly]

The entropy:account does not exist at all on the accounts side. I assume this was meant to be any:account (which is a generic account type we can use for dev purposes).

Also added stellar:account which is new account type we now support.

---

Note

Low Risk
Small enum alignment for keyring permissions; removing entropy:account could fail validation for any manifest that still declared it, but that value was never valid on the accounts side.

Overview
Aligns KeyringAccountType with @metamask/keyring-api in @metamask/snaps-sdk (permissions.ts) and @metamask/snaps-utils (KeyringAccountTypeStruct in keyring.ts).

Removed the invalid literal entropy:account. Added stellar:account and any:account so keyring capability typing and manifest/runtime validation accept the account types the accounts stack actually supports.

Changelogs for both packages document the fix under [Unreleased].

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.59%. Comparing base (52d3c27) to head (96b603c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4057   +/-   ##
=======================================
  Coverage   98.59%   98.59%           
=======================================
  Files         425      425           
  Lines       12413    12413           
  Branches     1969     1969           
=======================================
  Hits        12238    12238           
  Misses        175      175           

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