feat: better detection of native multichain assets

[bergarces]

Explanation

Currently, non-evm native assets were identified by a static list.

With this change, they will be identified when using slip44 as part of the asset namespace, instead of token.

References

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, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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Note

Infer isNative for non‑EVM assets from slip44 namespace and export AssetsByAccountGroup type.

• Selectors
  • Update selectAllMultichainAssets in selectors/token-selectors.ts to set isNative when caipAsset.assetNamespace === 'slip44' (remove static MULTICHAIN_NATIVE_ASSET_IDS).
• Exports
  • Export AssetsByAccountGroup from selectors/token-selectors via src/index.ts.
• Docs
  • Update CHANGELOG.md for the new export and isNative detection change.

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