feat: Token search and discovery with swaps

[ziad-saab]

Description

This PR adds token search and discovery features to MetaMask:

• browser URL bar now allows searching for tokens by name (prefix/autocomplete) and token address
• users can swap directly from the search results (will switch or add the network if they don't have it)
• users can see asset details for searched tokens, complete with price and market data
• users can swap the found asset from the asset details page's swap button (will switch or add the network if they don't have it)

Screenshots/Recordings

After

token-search.mp4

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
80.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud