Add PulseChain network

[bretep]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.

📝 Description

Adds support for the PulseChain network.
Please refer to #7607 which was pending being merged.

Testing

I've tested this PR with LedgerHQ/app-ethereum#626 installed on:

• Ledger Stax
• Nano S Plus

Dependencies

This PR requires the changes introduced in LedgerHQ/app-ethereum#626.

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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