support custom maxBytes in API file

[jiang4869]

custom maxBytes in api file can be used like this

type Request {
	Name string `path:"name,options=you|me"`
}

type Response {
	Message string `json:"message"`
}

@server(
	maxBytes: 1024
)
service A-api {
	@handler GreetHandler
	get /greet/from/:name(Request) returns (Response)
}

general code

// Code generated by goctl. DO NOT EDIT.
package handler

import (
	"net/http"

	"test/internal/svc"

	"github.com/zeromicro/go-zero/rest"
)

func RegisterHandlers(server *rest.Server, serverCtx *svc.ServiceContext) {
	server.AddRoutes(
		[]rest.Route{
			{
				Method:  http.MethodGet,
				Path:    "/greet/from/:name",
				Handler: GreetHandler(serverCtx),
			},
		},
		rest.WithMaxBytes(1024),
	)
}

For example, in the application of single architecture, there is a function to upload excel files and import data. At this time, the restapi interface for uploading files needs to increase the limit of the request body parameters. Although there is a rest.WithMaxBytes method, it cannot be generated through the api file. Once the api file is modified and regenerated, it will be very troublesome to manually modify the code.

[codecov-commenter]

Codecov Report

Merging #2822 (a12ff89) into master (ab9eeff) will decrease coverage by 0.04%.
The diff coverage is n/a.

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Impacted Files	Coverage Δ
zrpc/internal/rpcserver.go	94.31% <0.00%> (-5.69%)	⬇️

[kesonan]

LGTM