EP-217: Create event for Pledge Submit CTA

[leighdouglas]

📲 What

Added track event for "pledge submit" button clicks that fires when the "Pledge" button is pressed on the checkout screen.

🤔 Why

Segment Integration

🛠 How

• Created a new function to our AnalyticsEvents class that handles sending the event name and properties to the client.
• Added this function to the PledgeFragmentViewModel when the "Pledge" button is pressed.

👀 See

This is the button that fires this event:

📋 QA

• Tap on a live project
• Tap "Back this project" CTA at bottom of screen
• Select a reward and/or addons
• On the checkout screen, tap "Pledge"
• Both Segment (CTA Clicked) and DataLake (Pledge Submit Button Clicked) should appear in the segment dashboard.
  You should see context_cta = "pledge_submit" as well as context_type = "credit_card"

Story 📖

EP-217: Android: CTA Clicked (pledge_submit)

[Arkariang]

lgtm!