[Analytics] Add search query analytics tracking

[BrodyHughes]

Fixes BX-1695

Changes

Added new analytics event search_query to track user searches across different app surfaces
Implemented search tracking in three key areas:

• Command+K search bar
• Send token/NFT selection
• Swap token selection

Implementation Details

Added new event type with properties:

• location: Identifies where the search was initiated ('swap' | 'send' | 'commandk')
• query: The actual search string
• queryLength: Length of the search query

Search events are tracked when:

1. User executes a command in Cmd+K after searching
2. User selects a token/NFT in Send flow after searching
3. User selects a token in Swap flow after searching

Added cleanup tracking in Cmd+K to ensure searches are captured even if user closes without selection

Testing

Verify that search analytics events are properly tracked:

• Use Cmd+K and search for something
• Try searching in the Send flow when selecting tokens/NFTs
• Search for tokens in the Swap interface
• Verify the events include correct location, query string, and query length

The changes align with the existing search tracking in the Rainbow mobile app, providing consistency in analytics across platforms.

POW

Screen.Recording.2025-01-24.at.2.35.35.PM.mov

[linear]

BX-1695 Search tracking in Swap, Send, Cmd-K