feat(snaps): Add AssetSelector

[GuillaumeRx]

Description

This PR adds a new AssetSelector component to Snap UI.

Related issues

Fixes: #30575

Manual testing steps

1. Go to test-snaps
2. Use the send flow test snap
3. Look at the asset selector

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension 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]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [9a22941]

• builds: chrome, firefox
• builds (flask): chrome, firefox
• builds (MMI): chrome
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
  • content-script: 0
  • offscreen: 0

Page Load Metrics (2151 ± 127 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	487	2941	2067	436	209
		domContentLoaded	1776	2568	2077	179	86
		load	1797	3077	2151	265	127
		domInteractive	21	111	38	17	8
		backgroundConnect	15	389	70	79	38
		firstReactRender	18	78	39	23	11
		getState	8	185	37	40	19
		initialActions	0	1	0	0	0
		loadScripts	1300	1993	1592	157	75
		setupStore	9	62	23	19	9
		uiStartup	2096	4188	2532	458	220

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 79 Bytes (0.00%)
• ui: 8.68 KiB (0.11%)
• common: 1001 Bytes (0.01%)