fix: integrate multichainAssetsController

[sahar-fehri]

Description

PR to integrate the new MultichainAssetsController into metamask controller.

Related issues

Fixes:

Related: MetaMask/core#5138

Manual testing steps

1. Go to this page...

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 [4dd59cc]

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

Page Load Metrics (1622 ± 50 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	510	1829	1575	263	126
		domContentLoaded	1451	1759	1599	93	45
		load	1458	1831	1622	104	50
		domInteractive	24	83	42	21	10
		backgroundConnect	9	68	24	19	9
		firstReactRender	15	83	37	25	12
		getState	4	56	13	16	8
		initialActions	0	1	0	0	0
		loadScripts	1022	1320	1168	86	41
		setupStore	7	60	19	19	9
		uiStartup	1666	2521	1882	188	90

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

• background: 605 Bytes (0.01%)
• ui: 0 Bytes (0.00%)
• common: 65 Bytes (0.00%)