feat: attempt to CodeGen DynamoDB DocumentClient

[trivikr]

Issue

Attempt to use generate code for DocumentClient to fix #1223

Description

This was an attempt to generate code for DocumentClient, which was abandoned because of following reasons:

• The DynamoDB DocumentClient customization is specific to DynamoDB, and it's rarely updated. In JS SDK v2, the original DocumentClient was written in 2015 and the only major update it received was to add transact commands in 2018
• The customization output is fairly complex for some commands like batchGet/batchWrite. Writing a Java CodeGen for this customization would be even more complex. An example can viewed in file AddDocumentClientCommandsPlugin.java in this PR. The Java CodeGen cannot directly reuse existing client and command generators, and will have to write new ones.
• The manually written DocumentClient (written for PoC and design) already covers five commands - i.e. get, put, delete, batchGet, batchWrite. Only five more commands will need to be written.

Additional context

Will be super-ceded by #2062

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AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 9e9a1ac
• Result: FAILED
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