feat: adds fiat value to the swap totoken display

[ghgoodreau]

Description

This change will show the user the fiat amount of the balance of the token they are swapping to. This is useful for understanding price impact a bit better.

Related issues

Fixes: https://consensyssoftware.atlassian.net/browse/MMS-1854

Manual testing steps

1. Go to the swaps page in exension.
2. Try to swap a token.
3. Observe the fiat value displayed and that it is correct.

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 [43bf00b]

• 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, 13
  • content-script: 0
  • offscreen: 0

Page Load Metrics (1778 ± 65 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	268	1932	1555	537	258
		domContentLoaded	1386	1893	1749	135	65
		load	1395	1929	1778	134	65
		domInteractive	26	83	46	19	9
		backgroundConnect	7	58	23	17	8
		firstReactRender	15	74	33	20	10
		getState	5	74	16	18	9
		initialActions	0	1	0	0	0
		loadScripts	996	1484	1292	124	60
		setupStore	6	58	20	20	10
		uiStartup	1571	2161	2013	145	70

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 319 Bytes (0.00%)
• common: 0 Bytes (0.00%)