Update Response Parsing Protocol Tests

[jonathan343]

Note: Request serialization tests will be added in a follow up PR in effort to reduce the scope of this one.

Summary

This PR replaces the existing response parsing protocol tests in botocore/tests/unit/protocols/output with new tests generated from Smithy protocol test models. We use a version of these Smithy tests that are converted to the format currently supported by our existing test runner (test_protocols.py). This PR makes updates to the botocore Parsers and protocol test runner to comply with a majority of the new test cases.

Granular Protocol Ignore List

This PR introduces a protocol-tests-ignore-list.json file that can be used to ignore specific protocol test suites or cases. The structure for this list is defined below:

{
  "general": {
    "<test_type>": {
      "suites": [
        "Example test suite description",
      ],
      "cases": [
        "example-test-case-id"
      ]
    }
  },
  "protocols": {
    "<protocol_name>": {
      # Same as "general"  
    }
  }
}

• <test_type> - There are two types of protocol tests.
  • input - Request serialization protocol test.
  • output - Response parsing protocol test.
  • Note: Only output will work until the request serialization tests are updated.
• suites - A list of test suite descriptions to ignore. When specified, all test cases for the related suite will be ignored.
• cases - A list of test case ids to ignore.
• <protocol_name> - The protocol name as represented by its corresponding protocol test file name (without the .json) extension.
  • Supported values are ec2, json, json_1_0, query, rest-json, rest-xml. This may grow as we add more protocols.

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