feat: Add Web Snippet Sample App

[alexs-mparticle]

Instructions

1. PR target branch should be against development
2. PR title name should follow this format: https://github.com/mParticle/mparticle-workflows/blob/stable/.github/workflows/pr-title-check.yml
3. PR branch prefix should follow this format: https://github.com/mParticle/mparticle-workflows/blob/stable/.github/workflows/pr-branch-check-name.yml

Summary

• Introduces a new sample app for Web Snippet

Testing Plan

• N/A - This is a sample app to explain how the Snippet works.

Master Issue

• Closes https://go.mparticle.com/work/REPLACEME