Migrate sqs metricset to use cloudwatch input as light weight module

[kaiyan-sheng]

What does this PR do?

This PR is to migrate sqs metricset to use cloudwatch input as light weight module. Two main parts in this PR:

In the original sqs metricset, we are also making SQS ListQueues API call to get metadata for each SQS instance. This is added as a part of cloudwatch metricset now.
You can see under sqs metricset, there is only a manifest.yml file which defines cloudwatch as the input.

We need to keep backward compatibility with metric names so the dashboard can still be used.
You can see rename processor is used in manifest.yml file under rds metricset to make sure with this PR we are not introducing breaking changes. Also please check the updated data.json file in sqs metricset to see the renaming is effective.

Why is it important?

With this change, we no longer need to maintain the common code in both sqs metricset and cloudwatch metricset.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Build Cause: Started by user kaiyan-sheng

• Start Time: 2021-06-02T20:40:03.538+0000

• Duration: 104 min 12 sec

• Commit: a872981

Test stats 🧪

Test	Results
Failed	0
Passed	8690
Skipped	2483
Total	11173

Trends 🧪

💚 Flaky test report

Tests succeeded.

Expand to view the summary

Test stats 🧪

Test	Results
Failed	0
Passed	8690
Skipped	2483
Total	11173

[ChrsMark]

👍🏼 nice!