feat: add support for AWS rest-xml protocol

[kstich]

Add support for AWS rest-xml protocol

This commit adds support for the aws.rest-xml protocol, building
on top of the HttpBindingProtocolGenerator for document and
payload serde.

Implementations of the DocumentMember[Deser|Ser]Visitor and the
DocumentShape[Deser|Ser]Visitor have been created that handle
Smithy's XML traits and their influence on protocol serde.

A minor update has been made to the XmlNode to allow for nodes to
be renamed, as the same structure may change XML node names when it
is bound to different locations.

---

Handles namespaces on payloads/services/structures:

Payload:

  if (input.Tagging !== undefined) {
    contents = serializeAws_restXmlTagging(input.Tagging, context);
    body = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
    contents.addAttribute("xmlns", "http://s3.amazonaws.com/doc/2006-03-01/");
    body += contents.toString();
  }

Service for document:

  body = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
  const bodyNode = new __XmlNode("SelectObjectContent");
  bodyNode.addAttribute("xmlns", "http://s3.amazonaws.com/doc/2006-03-01/");

Structure specific:

  const bodyNode = new __XmlNode("Grantee");
  bodyNode.addAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");

Handles flattened and unflattened aggregate shapes:

Unflattened:

  if (input.TopicConfigurations !== undefined) {
    const nodes = serializeAws_restXmlTopicConfigurationList(input.TopicConfigurations, context);
    nodes.map((node: any) => {
      node = node.withName("TopicConfiguration");
      bodyNode.addChildNode(node);
    });
  }

Flattened:

  if (input.TagSet !== undefined) {
    const nodes = serializeAws_restXmlTagSet(input.TagSet, context);
    const containerNode = new __XmlNode("TagSet");
    nodes.map((node: any) => {
      containerNode.addChildNode(node);
    });
    bodyNode.addChildNode(containerNode);
  }

Handles attributes and names:

  if (input.Type !== undefined) {
    bodyNode.addAttribute("xsi:type", input.Type);
  }

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[AllanZhengYP]

Ship it! 🎉🎉

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