allow a build that disable string type

[fs-eire]

Description

Allow disabling string types and related operators using --disable_types string.

Motivation and Context

For some use scenarios we want to trim down the binary size so the build flag offers one more option.

[github-actions]

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[Copilot]

Pull request overview

This pull request adds the ability to disable string types and related operators using the --disable_types string build flag to reduce binary size. The implementation follows the established pattern used for other type-disabling flags (optional, sparsetensor, float4, float8).

Changes:

• Added "string" as a choice for the --disable_types build argument
• Added CMake option onnxruntime_DISABLE_STRING_TYPE and corresponding compile definition DISABLE_STRING_TYPE
• Wrapped string-specific text operators (StringSplit, StringNormalizer, StringConcat, RegexFullMatch) and TfIdfVectorizer with #if !defined(DISABLE_STRING_TYPE) guards
• Conditionally compiled string-typed kernel declarations and registrations in cpu_execution_provider.cc for operators: Expand, OneHot, Where, Equal, TfIdfVectorizer, StringNormalizer, StringConcat, RegexFullMatch, StringSplit
• Updated CI/CD workflow to include "string" in the list of disabled types for minimal build configurations

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tools/ci_build/build_args.py	Added "string" to the choices for --disable_types argument
tools/ci_build/build.py	Added logic to derive disable_string_type flag and pass it to CMake
cmake/CMakeLists.txt	Added onnxruntime_DISABLE_STRING_TYPE option and compile definition
onnxruntime/core/providers/cpu/text/string_split.h	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/text/string_split.cc	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/text/string_normalizer.h	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/text/string_normalizer.cc	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/text/string_concat.h	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/text/string_concat.cc	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/text/regex_full_match.h	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/text/regex_full_match.cc	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/nn/tfidfvectorizer.h	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/nn/tfidfvectorizer.cc	Wrapped entire file content with DISABLE_STRING_TYPE guard
onnxruntime/core/providers/cpu/cpu_execution_provider.cc	Added conditional compilation guards for string-typed kernel declarations and registrations
.github/workflows/linux_minimal_build.yml	Added "string" to all --disable_types flags in minimal build configurations

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