Move RDS lightweight module config into integration

[kaiyan-sheng]

What does this PR do?

This PR is to move lightweight module configuration from metricbeat into integrations. Also this PR adds collection to all RDS metrics to cover MSSQL metrics.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-06-03T16:17:23.605+0000

• Duration: 31 min 23 sec

Test stats 🧪

Test	Results
Failed	0
Passed	328
Skipped	0
Total	328

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (11/11)	💚
Files	91.667% (11/12)	👎 -4.893
Classes	91.667% (11/12)	👎 -4.893
Methods	82.439% (169/205)	👎 -6.423
Lines	92.673% (2087/2252)	👍 2.891
Conditionals	100.0% (0/0)	💚

[zmoog]

LGTM.