Shared process should have a clone of all profile storages

[sandy081]

Discovered from #212664

At present when syncing a profile, Settings gets snapshot of each profile storage from main and discards the snapshot as soon as the sync is finished. On an average, settings sync syncs all profiles once per 5 minutes. This means, every 5 minutes settings sync reads all profiles storages from main.

Ref:

vscode/src/vs/platform/userDataProfile/common/userDataProfileStorageService.ts

Lines 72 to 74 in da020b9

	async readStorageData(profile: IUserDataProfile): Promise<Map<string, IStorageValue>> {
	return this.withProfileScopedStorageService(profile, async storageService => this.getItems(storageService));
	}

Instead

• get profile storage from main when needed for the first time
• from there on sync the storage from main using listeners - incrementally update the profile storage

[sandy081]

@bpasero What is your opinion?

[bpasero]

Sounds good 👍