test(lib-dynamodb): enhance type safety

[siddsriv]

Issue

Internal JS-5189

Description

1. Defines NestedList and NestedMap types to describe structure of nested arrays and objects within test data, addressing TS2322 errors.
2. Adds an index signature to the DataType interface for addressing TS7053 errors that occurred when attempting to index objects without explicit index signatures.
3. Explicitly types the passError parameter as any, for TS7006 errors.

Testing

 PASS  src/test/lib-dynamodb.e2e.spec.ts (31.098 s)
  DynamoDBDocument
    ✓ initializes using the static constructor
    ✓ is using a random TableName=js-sdk-dynamodb-test-1715128811-le0x (1 ms)
    ✓ describes the test table
    ✓ creates the test table if it does not exist
    .
    .
    .
    ✓ can serialize class instances as maps (1 ms)
    updateTransformFunction
      ✓ modifies all fields of an object (3 ms)

Test Suites: 1 passed, 1 total
Tests:       85 passed, 85 total
Snapshots:   0 total
Time:        31.186 s
Ran all test suites.
Done in 32.00s.

Checklist

• If you wrote E2E tests, are they resilient to concurrent I/O?

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