feat: add monad to network enablement controller

[khanti42]

Explanation

Adds monad to network enablement controller constants

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

Adds Monad (chainId 0x8f / 143) to POPULAR_NETWORKS and updates the changelog.

• Network Enablement Controller:
  • Add 0x8f (Monad, 143) to POPULAR_NETWORKS in packages/network-enablement-controller/src/constants.ts.
• Changelog:
  • Document the addition under Unreleased in packages/network-enablement-controller/CHANGELOG.md.

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