feat: allow custom name on amplify managed table

[dpilch]

Description of changes

Allow custom name on Amplify managed table.

TODO: update documentation.

CDK / CloudFormation Parameters Changed

• Add tableName setter to the AmplifyDynamoDbTableWrapper class.

export const backend = defineBackend({
  auth,
  data,
});

backend
  .data
  .resources
  .cfnResources
  .amplifyDynamoDbTables
  .Todo
  .tableName = "MyCustomTableName";

Issue #, if available

#2991

Description of how you validated changes

• Unit tests
• TODO: add functional E2E test

Checklist

• PR description included
• yarn test passes
• E2E test run linked
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies
• Any CDK or CloudFormation parameter changes are called out explicitly

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.