add account support check in validator

[jiexi]

Explanation

Mirrors the wallet_createSession handler
in how eth account support is checked/asserted. Opted to do this rather than modify assertScopeSupported because the bucketScopes helper also relies on assertScopedSupported but doesn't care about accounts (which is why eth accounts are checked outside of assertScopeSupported in the wallet_createSession handler currently)

References

Changelog

@metamask/package-a

• : Your change here
• : Your change here

@metamask/package-b

• : Your change here
• : Your change here

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

[adonesky1]

LGTM