DynamoDB DocumentClient :: Update fails in case attribute name contains keyword ADD

[mjthor]

This is a Bug Report

Description

• What went wrong?
  Update fails in case attribute name contains keyword ADD (e.g. address)
  The problem is assumably caused by updateExpression split located here: https://github.com/getndazn/dazn-lambda-powertools/blob/master/packages/lambda-powertools-dynamodb-client/index.js#L26
• What did you expect should have happened?
  Update to work normally regardless of the attribute name
• What was the config (if any) you used?
  N/A
• What stacktrace or error message did you see?
  Invalid UpdateExpression: Syntax error; token: \"#\", near: \", #,\"

Similar or dependent issues:
N/A

Additional Data

• Which powertool package are you using?
  lambda-powertools-dynamodb-client
• Which version are you using?
  1.26.0
• Middy engine version you're using
  1.4.0
• Operating System
  AWS Lambda / NodeJS
• Stack Trace

ValidationException: Invalid UpdateExpression: Syntax error; token: \"#\", near: \", #,\"
    at Request.extractError (/node_modules/aws-sdk/lib/protocol/json.js:51:1)
    at Request.callListeners (/node_modules/aws-sdk/lib/sequential_executor.js:106:1)
    at Request.emit (/node_modules/aws-sdk/lib/sequential_executor.js:78:1)
    at Request.emit (/node_modules/aws-sdk/lib/request.js:688:1)
    at Request.transition (/node_modules/aws-sdk/lib/request.js:22:1)
    at AcceptorStateMachine.runTo (/node_modules/aws-sdk/lib/state_machine.js:14:1)
    at /node_modules/aws-sdk/lib/state_machine.js:26:1
    at Request.<anonymous> (/node_modules/aws-sdk/lib/request.js:38:1)
    at Request.<anonymous> (/node_modules/aws-sdk/lib/request.js:690:1)
    at Request.callListeners (/node_modules/aws-sdk/lib/sequential_executor.js:116:1)

• Provider Error messages:
  N/A