add sample for lambda event filtering with dynamodb and sqs

[HarshCasper]

Description

This PR:

• Adds sample code for lambda event filtering using AWS Lambda, SQS, DynamoDB, DynamoDB Streams.
• Adds relevant docs to get up and running with the sample.

[steffyP]

Thanks for adding this example @HarshCasper 🚀 🔝

We already discussed the things that could still be improved, just summarizing it here:

• please add a description to the PR
• add required dependencies to the prerequites (node version, ulid lib installed)
• add a short description on what is supposed to happen, and how it can be verified (e.g. lambda is triggered after adding sending message to the queue)

[steffyP]

nice work 🚀 😄 👍