feat: adds the experimental toggle for Solana

[zone-live]

Description

This PR sdds a new experimental toggle for Solana accounts. Everything is code fenced for Flask build.

Related issues

Fixes:

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 [8492b1e]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

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

Page Load Metrics (2145 ± 141 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	386	2840	2058	482	231
		domContentLoaded	1706	2791	2108	291	140
		load	1777	2840	2145	294	141
		domInteractive	18	91	48	20	10
		backgroundConnect	7	72	34	25	12
		firstReactRender	52	173	109	29	14
		getState	7	69	30	24	12
		initialActions	0	1	0	0	0
		loadScripts	1253	2197	1583	253	122
		setupStore	13	91	28	24	12
		uiStartup	1980	3149	2381	321	154

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

• background: 47 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 575 Bytes (0.01%)

[metamaskbot]

Builds ready [f1feedf]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

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

Page Load Metrics (3656 ± 723 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	392	5524	2661	1728	830
		domContentLoaded	1678	5593	3607	1504	722
		load	1688	5629	3656	1506	723
		domInteractive	29	307	125	86	41
		backgroundConnect	10	190	63	44	21
		firstReactRender	48	405	179	94	45
		getState	5	98	35	27	13
		initialActions	0	1	0	0	0
		loadScripts	1238	4254	2730	1147	551
		setupStore	15	98	45	23	11
		uiStartup	1975	6873	4107	1672	803

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

• background: 47 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 498 Bytes (0.01%)

[metamaskbot]

Builds ready [1c9a455]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

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

Page Load Metrics (1980 ± 67 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	309	2245	1913	390	187
		domContentLoaded	1744	2172	1948	133	64
		load	1749	2236	1980	139	67
		domInteractive	14	103	54	24	12
		backgroundConnect	8	84	31	23	11
		firstReactRender	58	185	107	25	12
		getState	5	61	22	21	10
		initialActions	0	1	0	0	0
		loadScripts	1255	1653	1441	113	54
		setupStore	12	81	36	27	13
		uiStartup	1977	2462	2230	133	64

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

• background: 47 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 442 Bytes (0.01%)