feat(typescript): Export EVM and Solana accounts

[sddioulde]

Description

This PR adds the ability to export EVM and Solana accounts.

EVM export by name:

await cdp.evm.exportAccount({
  name: 'MyAccount'
});

EVM export by address:

await cdp.evm.exportAccount({
  address: '0x123'
});

Solana export by name:

await cdp.solana.exportAccount({
  name: 'MyAccount'
});

Solana export by address:

await cdp.solana.exportAccount({
  address: 'Abc'
});

Tests

Added unit and e2e tests and examples.

Checklist

A couple of things to include in your PR for completeness:

• Updated the typescript README if relevant
• Added a changelog entry

[cb-heimdall]

✅ Heimdall Review Status

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