feat(transaction-controller): add atomic option

[matthewwalsh0]

Explanation

The addTransactionBatch method prioritises the EIP-7702 flow that uses ERC-7821 to execute batch transactions. The execute call encodes a mode byte that controls atomicity — currently hardcoded to 0x01 (atomic), meaning all calls in the batch revert together if any single call fails.

This PR makes the atomicity configurable via a new atomic boolean on TransactionBatchRequest:

• atomic: true (default) — mode 0x01, all calls revert together (existing behaviour, no breaking change)
• atomic: false — mode 0x00, calls are independent and individual calls can fail without reverting the entire batch

The option flows from TransactionBatchRequest through addTransactionBatchWith7702 into generateEIP7702BatchTransaction, which now accepts an optional options parameter. Callers that don't pass the option get the existing atomic behaviour.

References

• ERC-7821 Minimal Batch Executor

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them