Fix "attributes" typing for Node and Web SDKs

[ChiragAgg5k]

What does this PR do?

In our swagger specs, we have defined the typings for an attribute to be attributeBoolean, attributeInteger and so on... but in SDK generator although we have the typings defined, we default attribute's typing to an array of strings instead of using the defined typings.

This PR adds check if typings exist in "anyOf" field of the spec, and use those as a union.

Test Plan

Before:

attribute: string[]

After:

attributes: (Models.AttributeBoolean | Models.AttributeInteger | Models.AttributeFloat | Models.AttributeEmail | Models.AttributeEnum | Models.AttributeUrl | Models.AttributeIp | Models.AttributeDatetime | Models.AttributeRelationship | Models.AttributeString)[];

Related PRs and Issues

• 🐛 Bug Report: Collection attributes property is typed as a string array sdk-for-node#87

Have you read the Contributing Guidelines on issues?

Yes.