feat: integrate buf/validate (protovalidate) for field-level validation

[Kybxd]

• close fieldprop(check): support CEL to write custom rules #373

Summary

Integrate buf/validate (protovalidate) to support field-level validation rules in generated proto files and configuration generation.

Changes

Core Features

• Field-level validation: Add field_validate property to FieldProp, enabling proto field-level constraints (e.g., string:{min_len:1 max_len:20}, int32:{gt:0 lte:100}) via buf.validate.field option.
• Message-level validation: Add message_validate property to FieldProp, supporting CEL-based message-level constraints (e.g., cross-field validation like this.value <= 0 || this.name != '') via buf.validate.message option.
• Worksheet-level validation: Add Validate column in @TABLEAU metasheet, supporting CEL-based worksheet-level constraints via buf.validate.message option on the top-level message.
• CEL expression shorthand: Support cel_expression as a shorthand for simple CEL expressions (e.g., this.start_time < this.end_time), powered by upgrading buf.build/go/protovalidate to v1.1.0.

Implementation Details

• Add validate field to FieldProp in tableau.proto, and validate field to MetasheetOptions in metabook.proto.
• Update internal/protogen/exporter.go to generate buf.validate.field and buf.validate.message options in proto output.
• Update internal/protogen/field_prop.go to parse field_validate and message_validate properties.
• Update internal/confgen/util.go to handle buf/validate/validate.proto import path resolution.
• Add buf/validate/validate.proto to the proto compiler's well-known import paths.

Testing

• Add functional test CSV files: Validate#ValidateFieldLevel.csv, Validate#ValidateMessageLevel.csv, Validate#ValidateWorksheetLevel.csv with corresponding @TABLEAU.csv metasheet.
• Add expected proto and JSON output files for validation.
• Add unit tests for exporter_test.go and util_test.go.

Other

• Upgrade Go version to 1.24.x in CI workflows.
• Update go.mod dependencies including buf.build/go/protovalidate v1.1.0.

Bug Fixes (drive-by)

• Fix confgen.go: use sheetName instead of undefined specifiedSheetName in error context.
• Fix parser.go: remove redundant fmt.Sprintf wrapping inside xerrors.Newf.

[codecov]

Codecov Report

❌ Patch coverage is 91.02564% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.01%. Comparing base (31e9ace) to head (3fa0aef).

Files with missing lines	Patch %	Lines
internal/confgen/confgen.go	0.00%	3 Missing ⚠️
internal/confgen/parser.go	0.00%	2 Missing ⚠️
internal/protogen/exporter.go	93.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #378      +/-   ##
==========================================
+ Coverage   73.93%   74.01%   +0.08%     
==========================================
  Files          87       87              
  Lines        8670     8706      +36     
==========================================
+ Hits         6410     6444      +34     
- Misses       1700     1701       +1     
- Partials      560      561       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.