Added css assertion support

[vaibhrez12]

feat: Added support for css assertion for any element

Overview

This PR implements the feature to add assertion for css properties for any UI element using codegen recorder. Below the feature request issue handled in this PR - https://github.com/microsoft/playwright/issues/35113

Feature

1. Record the css property assertion using codegen. Recorder will show the following css properties with value by default in dialog box
   { "background-color":"rgb(172, 227, 230)", "font-style":"600 18px / 24px OpenSans, \"Segoe UI\", SegoeUI, \"Helvetica Neue\", Helvetica, Arial, sans-serif", "font-size":"18px" }

2. User can update the default properties value expected and also add additional properties in same format as below
   { "background-color":"rgb(172, 227, 230)", "font-style":"600 18px / 24px OpenSans, \"Segoe UI\", SegoeUI, \"Helvetica Neue\", Helvetica, Arial, sans-serif", "font-size":"18px", "text-align":"left" }

Benefits

This will help in recording css property assertions for UI elements using codegen.

[github-actions]

Test results for "tests 1"

3 flaky

⚠️ [firefox-page] › tests/page/page-evaluate.spec.ts:403:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18
⚠️ [chromium-library] › tests/library/inspector/cli-codegen-pytest.spec.ts:73:5 › should work with --save-har @ubuntu-22.04-chromium-tip-of-tree
⚠️ [webkit-page] › tests/page/page-screenshot.spec.ts:345:5 › page screenshot › should work while navigating @webkit-ubuntu-22.04-node18

38667 passed, 803 skipped
✔️✔️✔️

Merge workflow run.

[jfgreffier]

Lint does not pass because of code formatting.

# this should pass with no error
npm run lint
# try this
npm run lint -- --fix

Please check the contributor guide https://github.com/microsoft/playwright/blob/main/CONTRIBUTING.md
I think it is expected to have documentation, test, and commits using conventional commits

Is there an existing issue to discuss this change ? I feel this contribution falls in this category:

Playwright requires an issue for every contribution, except for minor documentation updates. We strongly recommend to pick an issue labeled open-to-a-pull-request for your first contribution to the project.

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