Export SubmitResult type from sdk-statement

[Copilot]

The SubmitResult type was defined and used internally but not exported, preventing consumers from properly typing the submit method's return value.

Changes

• Export SubmitResult type from src/index.ts following the pattern used in other SDK packages (e.g., sdk-multisig)

Usage

import { createStatementSdk, type SubmitResult } from '@polkadot-api/sdk-statement'

const sdk = createStatementSdk(client)
const result: SubmitResult = await sdk.submit(statement)

// Type-safe handling of different result statuses
if (result.status === 'rejected') {
  console.log(`Rejected: ${result.reason}`)
}

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[carlosala]

5min to add a single line, we need to improve there @copilot 😅

[Copilot]

Pull request overview

This PR addresses a missing type export by adding SubmitResult to the public API of @polkadot-api/sdk-statement. The SubmitResult type is returned by the submit method of the SDK but was previously not exported, preventing consumers from properly typing their code.

• Exports the SubmitResult type from the package's main index file
• Follows the established pattern used in other SDK packages (e.g., sdk-multisig, sdk-ink)
• Enables type-safe handling of submit method responses with their various status variants (new, known, rejected, invalid)

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