Add config to support persistentContext

[karthikiyengar]

Addresses #188

[coveralls]

Pull Request Test Coverage Report for Build 156610594

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.603%

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Totals
Change from base Build 155480860:	0.0%
Covered Lines:	79
Relevant Lines:	83

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 156610594

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.603%

---

Totals
Change from base Build 155480860:	0.0%
Covered Lines:	79
Relevant Lines:	83

---

💛 - Coveralls

[mmarkelov]

@karthikiyengar thank you for your PR. I just made #193
You will be configure type of launching browser:

// jest-playwright.config.js
module.exports = {
    userDataDir: 'profile',
    launchType: 'PERSISTENT',
}