Add SQSProvider

[alexdebrie]

What did you implement:

Adds a provider for AWS SQS that puts an event into an SQS Queue with a provider type of awssqs.

How did you implement it:

Pretty straight-forward -- implemented the required provider code.

How can we verify it:

Provision an SQS queue and save the Queue URL. Create some AWS access keys for a user that have sendMessage permission on the queue. Then:

1. Register the Queue as a function:

curl -X POST \
http://localhost:4001/v1/spaces/default/functions \
  -H 'Content-Type: application/json' \
  -d '{
    "functionId": "sqs",
    "type": "awssqs",
    "provider": {
        "queueUrl": "<yourQueueUrl>",
        "region": "us-east-1",
        "awsAccessKeyId": "<key>",
        "awsSecretAccessKey": "<secret>"
    }
}’

2. Register a subscription for the function:

curl -X POST \
http://localhost:4001/v1/spaces/default/subscriptions \
  -H 'Content-Type: application/json' \
  -d '{
    "functionId": "sqs", 
    "event": "http",
    "method": "POST",
    "path": "/"
}’

3. Trigger the subscription:

curl -X POST \
http://localhost:4000/ \
  -H 'Content-Type: application/json' \
  -d '{
    "message": "test message"
}’

4. Verify that your Queue has a message:

aws sqs receive-message --queue-url https://queue.amazonaws.com/786336638212/testQueue
{
    "Messages": [
        {
            "Body": "{\"event\":\"http\",\"id\":\"fed3bee0-7a75-42ef-85a7-0dcb118acba5\",\"receivedAt\":1521942191472,\"data\":{\"headers\":{\"Accept\":\"*/*\",\"Accept-Encoding\":\"gzip, deflate\",\"Cache-Control\":\"no-cache\",\"Connection\":\"keep-alive\",\"Content-Length\":\"30\",\"Content-Type\":\"application/json\",\"Postman-Token\":\"1d0947c7-48f9-400c-8b76-37f94403f40a\",\"User-Agent\":\"PostmanRuntime/7.1.1\"},\"query\":{},\"body\":{\"message\":\"test message\"},\"host\":\"localhost:4000\",\"path\":\"/\",\"method\":\"POST\",\"params\":null},\"dataType\":\"application/json\"}",
            "ReceiptHandle": "AQEBDf4eQm17dSDC5x7HGg2WhPci6/vCZJ0XKLNUg8jRxSNWpUAG/ic53+t6GkhsZYwyGzhK21Lz/tsOFCJeNA55N5FG5yApdlxmMQdmCs4hjsLfstcr7KG5/OQzgT3zj+o0+QWZjPfl+QFu1cVcTcBoa2JlpsHMnylm8tifRCP2tbE61+QClqlv63yyuryc5ICwHLhPvvWqokQaW+bbhaHaSkgeLxulILY1/MCE+PV/UhVwzCNQ/2RqLWlkPLdkQoaPSJEjwuerQcEgJKvecgFJlkbRexxVA7VPhSpmtsb6lOjaiA/eeRKGaUdDipkfvnTsiWZV7Jkwclxt1JGjsHgMeB/0kMu8ac78eLRehcWZJpMzedMpjSHvBAUhHLnnL6kN",
            "MD5OfBody": "3d8830dd49818fee5a2fd3b8d598acb4",
            "MessageId": "78540693-d590-4a14-8691-2cd1eebb31e5"
        }
    ]
}

💥

Todos:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[codecov]

Codecov Report

Merging #399 into master will increase coverage by 0.57%.
The diff coverage is 79.54%.

@@            Coverage Diff             @@
##           master     #399      +/-   ##
==========================================
+ Coverage   59.51%   60.09%   +0.57%     
==========================================
  Files          25       26       +1     
  Lines        1477     1521      +44     
==========================================
+ Hits          879      914      +35     
- Misses        555      564       +9     
  Partials       43       43

Impacted Files	Coverage Δ
providers/awssqs/awssqs.go	79.54% <79.54%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c909055...3deae6e. Read the comment docs.

[mthenw]

Please update OpenAPI spec (also would be great if you could update awsfirehose there :))

[mthenw]

@alexdebrie ignore the Codacy status.

[alexdebrie]

@mthenw Done