Making the overload of SaveAsByTemplate with a Stream as template parameter public and callable in the API

[michelebastione]

This fixes issue #834 on the maintenance branch

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[gemini-code-assist]

Summary of Changes

Hello @michelebastione, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the MiniExcel library by exposing a new set of API methods that allow for generating Excel files from templates provided as Stream objects. This provides greater flexibility for integrating template-based Excel generation into applications where templates might originate from memory, network streams, or other non-file sources, directly addressing issue #834.

Highlights

• New API Overloads for Stream-based Templates: I've introduced new public overloads for SaveAsByTemplate and SaveAsByTemplateAsync methods across the MiniExcel and MiniExcel.Async static classes, as well as the IExcelTemplate and IExcelTemplateAsync interfaces. These new methods allow users to provide the Excel template as a Stream object, offering more flexibility for template sources beyond file paths or byte arrays.
• Internal Implementation Exposure and Refinement: The core SaveAsByTemplate method within ExcelOpenXmlTemplate.cs that handles Stream inputs has been changed from internal to public. This change directly enables the new public API overloads. Additionally, I've added a check to ensure the provided template Stream is seekable and explicitly reset its position to the beginning before processing, preventing potential issues with non-reset streams.
• Version Update: The project version in MiniExcelLibs.csproj has been incremented from 1.41.3 to 1.41.4 to reflect these new API additions and bug fixes.

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[gemini-code-assist]

Code Review

This pull request introduces the SaveAsByTemplate functionality with a Stream as a template parameter. I have a couple of suggestions to improve exception handling and code consistency.