Add perf tests for eventgrid (#16949)

* initialize

* implementation

* Update sdk/eventgrid/azure-eventgrid/tests/perfstress_tests/README.md

* comments

sdk/eventgrid/azure-eventgrid/tests/perfstress_tests/README.md

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+# EventGrid Performance Tests
+
+In order to run the performance tests, the `azure-devtools` package must be installed. This is done as part of the `dev_requirements`.
+Start by creating a new virtual environment for your perf tests. This will need to be a Python 3 environment, preferably >=3.7.
+
+### Setup for test resources
+
+These tests will run against a pre-configured Eventgrid topic. The following environment variable will need to be set for the tests to access the live resources:
+```
+EG_ACCESS_KEY=<access key of your eventgrid account>
+EG_TOPIC_HOSTNAME=<hostname of the eventgrid topic>
+```
+
+### Setup for perf test runs
+
+```cmd
+(env) ~/azure-eventgrid> pip install -r dev_requirements.txt
+(env) ~/azure-eventgrid> pip install -e .
+```
+
+## Test commands
+
+```cmd
+(env) ~/azure-eventgrid> cd tests
+(env) ~/azure-eventgrid/tests> perfstress
+```
+
+### Common perf command line options
+These options are available for all perf tests:
+- `--duration=10` Number of seconds to run as many operations (the "run" function) as possible. Default is 10.
+- `--iterations=1` Number of test iterations to run. Default is 1.
+- `--parallel=1` Number of tests to run in parallel. Default is 1.
+- `--warm-up=5` Number of seconds to spend warming up the connection before measuring begins. Default is 5.
+- `--sync` Whether to run the tests in sync or async. Default is False (async).
+- `--no-cleanup` Whether to keep newly created resources after test run. Default is False (resources will be deleted).
+
+### EventGrid Test options
+These options are available for all eventgrid perf tests:
+- `--num-events` Number of events to be published using the send method.
+
+### T2 Tests
+The tests currently written for the T2 SDK:
+- `EventGridPerfTest` Publishes a list of eventgrid events.
+
+## Example command
+```cmd
+(env) ~/azure-eventgrid/tests> perfstress EventGridPerfTest --num-events=100
+```

sdk/eventgrid/azure-eventgrid/tests/perfstress_tests/send.py

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+#-------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+#--------------------------------------------------------------------------
+
+import asyncio
+from azure_devtools.perfstress_tests import PerfStressTest
+
+from azure.eventgrid import EventGridPublisherClient as SyncPublisherClient, EventGridEvent
+from azure.eventgrid.aio import EventGridPublisherClient as AsyncPublisherClient
+
+from azure.core.credentials import AzureKeyCredential
+
+class EventGridPerfTest(PerfStressTest):
+    def __init__(self, arguments):
+        super().__init__(arguments)
+
+        # auth configuration
+        topic_key = self.get_from_env("EG_ACCESS_KEY")
+        endpoint = self.get_from_env("EG_TOPIC_HOSTNAME")
+
+        # Create clients
+        self.publisher_client = SyncPublisherClient(
+            endpoint=endpoint,
+            credential=AzureKeyCredential(topic_key)
+        )
+        self.async_publisher_client = AsyncPublisherClient(
+            endpoint=endpoint,
+            credential=AzureKeyCredential(topic_key)
+        )
+
+        self.event_list = []
+        for _ in range(self.args.num_events):
+            self.event_list.append(EventGridEvent(
+                event_type="Contoso.Items.ItemReceived",
+                data={
+                    "services": ["EventGrid", "ServiceBus", "EventHubs", "Storage"]
+                },
+                subject="Door1",
+                data_version="2.0"
+            ))
+
+    async def close(self):
+        """This is run after cleanup.
+        
+        Use this to close any open handles or clients.
+        """
+        await self.async_publisher_client.close()
+        await super().close()
+
+    def run_sync(self):
+        """The synchronous perf test.
+        
+        Try to keep this minimal and focused. Using only a single client API.
+        Avoid putting any ancilliary logic (e.g. generating UUIDs), and put this in the setup/init instead
+        so that we're only measuring the client API call.
+        """
+        self.publisher_client.send(self.event_list)
+
+    async def run_async(self):
+        """The asynchronous perf test.
+        
+        Try to keep this minimal and focused. Using only a single client API.
+        Avoid putting any ancilliary logic (e.g. generating UUIDs), and put this in the setup/init instead
+        so that we're only measuring the client API call.
+        """
+        await self.async_publisher_client.send(self.event_list)
+
+    @staticmethod
+    def add_arguments(parser):
+        super(EventGridPerfTest, EventGridPerfTest).add_arguments(parser)
+        parser.add_argument('-n', '--num-events', nargs='?', type=int, help='Number of events to be sent. Defaults to 100', default=100)