feat: update WebsiteXML

[fangbinwei]

According to document
add 'SupportSubDir', 'Type' to 'IndexDocument'.
add 'KeySuffixEquals' to 'Condition'

The document also contains new config EnableReplacePrefix. It seems it is not very necessary, so it is not included in this commit.

base

	wxml := oss.WebsiteXML{}
	wxml.IndexDocument.Suffix = "index.html"
	wxml.ErrorDocument.Key = "404.html"

	output, _ := xml.MarshalIndent(wxml, "  ", "    ")
	fmt.Printf("%s\n", output)

output

  <WebsiteConfiguration>
      <IndexDocument>
          <Suffix>index.html</Suffix>
      </IndexDocument>
      <ErrorDocument>
          <Key>404.html</Key>
      </ErrorDocument>
      <RoutingRules></RoutingRules>
  </WebsiteConfiguration>

set SupportSubDir, Type

	bEnable := true
	supportSubDirType := 0
	wxml := oss.WebsiteXML{}
	wxml.IndexDocument.Suffix = "index.html"
	wxml.ErrorDocument.Key = "404.html"
	wxml.IndexDocument.SupportSubDir = &bEnable
	wxml.IndexDocument.Type = &supportSubDirType

	output, _ := xml.MarshalIndent(wxml, "  ", "    ")
	fmt.Printf("%s\n", output)

output

  <WebsiteConfiguration>
      <IndexDocument>
          <Suffix>index.html</Suffix>
          <SupportSubDir>true</SupportSubDir>
          <Type>0</Type>
      </IndexDocument>
      <ErrorDocument>
          <Key>404.html</Key>
      </ErrorDocument>
      <RoutingRules></RoutingRules>
  </WebsiteConfiguration>

[CLAassistant]

All committers have signed the CLA.