feat: add a parameter named autoStrip

[delei]

Purpose of the pull request

Close #421

What's changed?

• add strip and isBlankChar methods for whitespace handling in the StringUtils.
• add a parameter named autoStrip with a default value of false.
• automatic strip includes sheet name and content.

BTW, we may upgrade to a higher JDK version in the future. At that time, we will only need to modify the StringUtils#strip method , such as replacing it with java.lang.String#strip.

Checklist

• I have read the Contributor Guide.
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

[Copilot]

Pull Request Overview

This PR adds a new autoStrip parameter with a default value of false to complement the existing autoTrim functionality. The feature provides automatic whitespace stripping for both sheet names and cell content, supporting a broader range of whitespace characters compared to standard trim operations.

• Add StringUtils.strip() and StringUtils.isBlankChar() methods for enhanced whitespace handling
• Integrate autoStrip parameter throughout the codebase (readers, writers, and configuration)
• Update sheet name matching logic to support stripping of whitespace characters

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
StringUtils.java	Adds strip() method and isBlankChar() helper for extended whitespace detection
StringUtilsTest.java	Comprehensive tests for the new strip functionality
AutoStripParameterTest.java	Integration tests covering autoStrip behavior across Excel formats
ParameterUtil.java	Utility methods for determining autoTrim/autoStrip flags in read/write contexts
GlobalConfiguration.java	Adds autoStrip configuration with default false value
Multiple handlers	Updates cell data processing to apply strip logic when autoStrip is enabled
CSV builders	Integrates autoStrip with CSV trim behavior
SheetUtils.java	Updates sheet name matching to support autoStrip functionality

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[psxjoy]

LGTM