Dev Tools should support PATCH method #2343

Reproduction:

• Find some documentation about a scenario in OpenSearch APIs that use a PATCH command, like
• Get excited to try it out in your own cluster
• Open Dashboards, login as an admin user
• Navigate to Dev Tools
• Paste the following into the console window

PATCH _plugins/_security/api/roles/my_role
[
  {
    "op": "replace", "path": "/index_permissions/0/fls", "value": ["myfield1", "myfield2"]
  },
  {
    "op": "remove", "path": "/index_permissions/0/dls"
  }
]

• Select that text and hit the 'send request' button

Expected:

The request should succeed

Actual:

An error message appears in the response window:

{"statusCode":400,"error":"Bad Request","message":"[request query.method]: Method must be one of, case insensitive ['HEAD', 'GET', 'POST', 'PUT', 'DELETE']. Received 'PATCH'."}

Be sad you can't use this great tool to vet the scenario called out in the documentation