feat: add @preview decorator

[SebastianSedzik]

Runs a @test(s) or @suite(s) in preview (headed browser) mode, simulating user interaction (slowing down each operation by 1000ms).
Tests or suites without the @preview decorator will not be excluded.

import { suite, test, preview, TestArgs } from 'playwright-decorators';

// Preview selected test suite(s)
@preview() // <-- Decorate suite with @preview()
@suite()
class PreviewTestSuite {
}

// Or preview selected test(s)
@suite()
class TestSuite {
    @preview() // <-- Decorate test with @preview()
    @test()
    async test({ page }: TestArgs) {
        // ...
    }
}

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