Add support for new Snaps state methods

[Mrtenz]

Description

This adds support for new methods to manage state from Snaps:

• snap_getState
• snap_setState
• snap_clearState

These will eventually replace the snap_manageState method we have currently.

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.

[metamaskbot]

Builds ready [3646fe2]

• 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, 7
  • common: 0, 1, 10, 11, 12, 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 (2196 ± 119 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	257	2919	2035	583	280
		domContentLoaded	1700	2821	2159	245	118
		load	1709	2868	2196	247	119
		domInteractive	24	93	45	20	9
		backgroundConnect	10	95	40	25	12
		firstReactRender	16	94	31	21	10
		getState	118	305	157	51	25
		initialActions	0	1	0	0	0
		loadScripts	1258	2155	1656	203	97
		setupStore	7	16	9	2	1
		uiStartup	2170	3284	2574	278	134

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

• background: 322 Bytes (0.01%)
• ui: 0 Bytes (0.00%)
• common: 50 Bytes (0.00%)