feat(profile-metrics-controller): add proof of ownership API pre-requisites

[mathieuartu]

Explanation

References

Related to: https://consensyssoftware.atlassian.net/browse/MUL-1843

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 communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Medium Risk
Introduces authenticated nonce batching and optional cryptographic proofs sent to the auth API; behavior is well-tested but touches account-verification and bearer-token flows.

Overview
Adds proof-of-ownership plumbing in @metamask/profile-metrics-controller so later callers can verify accounts with the auth API.

ProfileMetricsService gains fetchNonces (ProfileMetricsService:fetchNonces), calling POST …/nonce/batch with bearer auth, credentials: 'omit', optional entropy-source scoping, and 50-identifier chunking merged in parallel. Responses are validated with superstruct and rejected if identifiers are missing, extra, duplicated, or malformed (same retry/circuit policy as submitMetrics).

submitMetrics account payloads may include an optional proof (nonce + signature); JSON includes it only when set.

New canonicalizeAddress (and ProofUnsupportedNamespaceError) normalizes addresses per namespace (eip155, solana, tron, bip122) for auth API canonical forms—utility + tests only in this PR, not yet wired into the controller polling path.

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[ccharly]

LGTM!