feat(map): Rename BatchResult to MapResult, use MapResultItem, reorder MapFunction params

[ayushiahjolia]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Issue Link, if available

#39

Description

• Rename BatchResult to MapResult and replace the two separate lists (results, errors) with a single List<MapResultItem> where each item holds status, result, and error. This gives callers a unified per-item view instead of correlating parallel lists by index.
• Remove Jackson-specific annotations (@JsonProperty, @JsonCreator, @JsonIgnore) from the result model. Use Java bean conventions (default constructor + getters) so MapResult and MapResultItem work with any customer-provided SerDes implementation, not just Jackson.
• Move DurableContext to the last parameter in MapFunction.apply() to stay consistent with other user-provided functions in the SDK: from apply(DurableContext context, I item, int index) to apply(I item, int index, DurableContext context)
• Update all call sites across SDK, integration tests, examples, and documentation.

Demo/Screenshots

Checklist

• I have filled out every section of the PR template
• I have thoroughly tested this change

Testing

Unit Tests

Have unit tests been written for these changes? N/A

Integration Tests

Have integration tests been written for these changes? N/A

Examples

Has a new example been added for the change? (if applicable) N/A