fix: include simulation save flags

[samsamtrum]

Adds save and save_if_fails to simulation transaction parameters and forwards both fields into the API request body for single and bundle simulations.

The SDK currently lets callers build simulation requests from TransactionParameters, but those two API-supported flags are missing from the type and are dropped when call_args is built.

Also adds a focused request-builder test covering both single and bundle simulations.

Checked with:

• git diff --check
• corepack pnpm install --ignore-scripts --frozen-lockfile
• corepack pnpm exec jest test/simulator.request.test.ts --runInBand
• corepack pnpm exec tsc --noEmit

Refs #98

[changeset-bot]

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Latest commit: 29e8663

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