Add filterSensitiveLog method to Structure namespaces

[trivikr]

Issue #, if available:
N/A

Description of changes:
This PR covers all cases for filterSensitiveLogs

Testing done prior to code change on TypeScript playground:

• Array
• Object
• Array of arrays
• Array of objects
• Object of arrays
• Object of objects

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[trivikr]

CodeGen PR aws/aws-sdk-js-v3#1130

[kstich]

There's a lot of duplicate type checking, casting, and iteration logic in these methods. It also looks like some instances where isIterationRequired might need to be used are dropped because of this.

You can reduce this surface by implementing a ShapeVisitor.Default<Void> that writes and recurses only for shapes that sensitive iteration is required. It would look loosely similar to the SmithyIdlModelSerializer and recurse using something like memberTarget.accept(this);.

[trivikr]

There's a lot of duplicate type checking, casting, and iteration logic in these methods.

You can reduce this surface by implementing a ShapeVisitor.Default that writes and recurses only for shapes that sensitive iteration is required

Any Shape has to be call filterSensitiveLog for its members which are not of SimpleShape type, as the work of filtering sensitive values is delegated to the members. Using a ShapeVisitor won't help in this case.

From the TypeScript playground example of array of objects, the testStructure or testList doesn't know which members of User are sensitive and call User.filterSensitiveLog

[trivikr]

It also looks like some instances where isIterationRequired might need to be used are dropped because of this.

The purpose of isIterationRequired is to not call filterSensitiveLog function for complex shapes of SimpleShape. For example:

• array of SimpleShapes
• array of arrays of SimpleShapes
• map of SimpleShapes
• map of maps of SimpleShapes
• array of maps of SimpleShapes
• maps of arrays of SimpleShapes

Can you share an example where isIterationRequired might be used where not required, or not used where required?