FEATURE: add method call based default valuer

[c9s]

Usage

users can now customize the default valuer by defining a method:

func (r *Request) GetDefaultClientOrderID() string { ... }

struct {
clientOrderID string `param:"clientOrderID" defaultValuer:"method"`
}

[gx578007]

Should be at least 1.24?

[c9s]

We can update to 1.24

[Copilot]

Pull Request Overview

This PR adds support for method-based default values in the requestgen code generator, allowing users to define custom default values by implementing methods like GetDefaultFieldName(). The changes update Go toolchain dependencies and enhance the generated code with better parameter handling and validation.

• Adds method-based default valuer support with defaultValuer:"method" tag option
• Updates Go toolchain from 1.21.0 to 1.23.0 and dependency versions
• Improves generated code with slice parameter handling and response unmarshaling

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
go.mod	Updates Go version to 1.23.0 and dependency versions
example/api/place_order_request.go	Adds Meta struct and demonstrates method-based default valuer usage
example/api/place_order_request_requestgen.go	Shows generated code with new method-based defaults and improved parameter handling
cmd/requestgen/main.go	Implements core logic for method-based default valuers and field parsing
cmd/requestgen/field.go	Adds ReceiverName and IsPointer fields to support new functionality
cmd/requestgen/tmplfuncs.go	Adds title function for method name generation
cmd/requestgen/utils.go	Improves logging with proper log levels
example/api/v1/*.go	Generated code updates showing slice handling and response validation improvements

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