feat: add coinbase prime connector

[altitude]

Introduce the Coinbase Prime connector with account, balance, payment syncing, and wallet-to-wallet transfer support.

Implemented capabilities

• CAPABILITY_FETCH_ACCOUNTS
• CAPABILITY_FETCH_BALANCES
• CAPABILITY_FETCH_PAYMENTS
• CAPABILITY_CREATE_TRANSFER

What’s included

• Accounts sync:
  • Portfolios and wallets discovered via Prime SDK.
  • Metadata per account:
    • spec.coinbase.com/type: portfolio or wallet
    • spec.coinbase.com/portfolio_id: portfolio UUID
    • spec.coinbase.com/wallet_type: wallet kind (for wallets)
• Balances:
  • Portfolio balances (by portfolio ID).
  • Wallet balances (by portfolio ID + wallet ID).
• Payments:
  • Transactions listing for portfolios and for wallets (paged).
  • Status mapping to internal PaymentStatus.
  • Amount parsing with crypto precision overrides (BTC/8, ETH/8, SOL/9, USDC/6).
• Transfers:
  • Wallet-to-wallet transfers using CreateWalletTransfer.
  • Enforces wallet-only transfers via metadata.
  • Uses connector idempotency keys.
  • Converts minor units to decimal string per currency precision.

Notes and constraints

• Transfers currently supported only for accounts with spec.coinbase.com/wallet_type: wallet.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/coinbase-connector

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