Add Cucumber step definitions for Percy visual testing

[neha-sanse]

Summary

• Add PercySteps class in io.percy.selenium.cucumber package with Gherkin step definitions for Percy Snapshot, Screenshot (Automate), and Create Percy Region
• Cucumber dependency is provided scope -- users bring their own Cucumber version
• Unit tests for all step definitions

Cucumber Steps

Snapshot (DOM)

When I take a Percy snapshot named "Homepage"
When I take a Percy snapshot named "Responsive" with widths "375,768,1280"
When I take a Percy snapshot named "Styled" with Percy CSS "h1 { color: red; }"
When I take a Percy snapshot named "Scoped" with scope ".todoapp"
When I take a Percy snapshot named "Layout" with layout mode
When I take a Percy snapshot named "Tagged" with labels "smoke,regression"

Screenshot (Automate)

When I take a Percy screenshot named "Login Page"
When I take a Percy screenshot named "Cart" with regions

Regions

Given I create a Percy ignore region with CSS selector ".ad-banner"
Given I create a Percy ignore region with XPath "//header"
Given I create a Percy ignore region with bounding box 0, 0, 600, 80
Given I create a Percy consider region with CSS selector ".content"
Given I create a Percy consider region with CSS selector ".content" and diff sensitivity 3
Given I create a Percy intelliignore region with CSS selector ".dynamic"

Setup

@Before
public void setUp() {
    driver = new ChromeDriver();
    PercySteps.setDriver(driver);
}

@After
public void tearDown() {
    driver.quit();
    PercySteps.reset();
}

Test plan

• Unit tests pass for all step definitions
• Compile with Cucumber 7.x provided dependency
• Verify steps work in a Cucumber feature file with Percy exec

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